mcq on problem solving in c

• C Programming

C Programming Multiple Choice Questions (MCQs) and Answers

Master C Programming with Practice MCQs. Explore our curated collection of Multiple Choice Questions. Ideal for placement and interview preparation, our questions range from basic to advanced, ensuring comprehensive coverage of C Programming. Begin your placement preparation journey now!

Q1 Why is learning programming important in today's world?

For academic purposes only

To automate and solve complex problems

Only for software development

For entertainment purposes only

Report a Problem!

Q2 What is the main function of a compiler in programming?

To write code

To interpret code

To convert code into machine language

To debug code

Q3 Which of the following is true about interpreters?

They execute programs faster than compilers

They translate the entire program at once

They translate and execute code line by line

They are not used in modern programming

Q4 How does a compiler differ from an interpreter?

A compiler executes code, while an interpreter does not

A compiler debugs code, while an interpreter does not

A compiler translates the entire program at once, while an interpreter translates it line by line

A compiler is used only in C programming, while an interpreter is not

Q5 What is the primary purpose of writing a "Hello World" program when learning a new programming language?

To test if the language supports string operations

To learn complex programming concepts

To demonstrate basic syntax and output

To introduce advanced programming features

Q6 What will be the output of the following C program? #include <stdio.h> int main() { printf("Hello, World!"); return 0; }

Hello, World!

Syntax Error

Q7 Identify the error in this C program: #include <stdio.h> int main() { print("Hello, World!"); return 0; }

Missing #include statement

Incorrect function name

Syntax error in return statement

Q8 Which of the following is not a keyword in C?

Q9 What data type would you use to store a character in C?

Q10 Which of the following is a valid identifier in C?

none of these

Q11 What is the size of 'int' data type in C?

Depends on the system

Q12 What is the difference between 'float' and 'double' data types in C?

Syntax only

No difference

Q13 What will be the output of the following C code? int main() { char c = 'A'; printf("%d", c); return 0; }

None of these

Q14 Identify the error in this C code: int main() { int number = 100.5; printf("%d", number); return 0; }

Assigning float to int

Syntax error

Wrong printf format

Q15 Spot the error in this code snippet: #include <stdio.h> int main() { const int age; age = 30; printf("%d", age); return 0; }

Uninitialized constant

Missing return statement

Syntax error in printf statement

Q16 What is the purpose of the printf function in C?

To read input

To print output

To perform calculations

To control program flow

Q17 What does %d signify in the printf or scanf function?

Double data type

Decimal integer

Dynamic allocation

Directory path

Q18 What will be the output of the following C code? int main() { printf("%d", 500); return 0; }

Q19 What will the following C code output? int main() { int num; scanf("%d", &num); printf("%d", num); return 0; }

The inputted number

Q20 Pseudocode: READ number PRINT "The number is ", number What does this pseudocode do?

Reads and prints a number

Prints a fixed number

Generates a random number

Q21 Identify the error in this C code: int main() { int x; scanf("%d", x); printf("%d", x); return 0; }

Missing & in scanf

Wrong format specifier

Q22 Find the mistake in this code: int main() { float num; printf("Enter a number: "); scanf("%f", num); printf("You entered: %f", num); return 0; }

Incorrect format specifier in printf

Q23 Which operator is used for division in C?

Q24 What does the '==' operator check?

Greater than

Q25 What is the result of the logical expression (1 && 0)?

Q26 What does the '+' operator do in C?

Subtraction

Multiplication

Q27 Which operator has higher precedence, '+' or '*'?

Both are same

Q28 What does the '!' operator do in C?

Q29 What is the output of the expression 2<3?

Q30 What will be the output of the following C code? int main() { int a = 10, b = 5; printf("%d", a / b); return 0; }

• C Data Types
• C Operators
• C Input and Output
• C Control Flow
• C Functions
• C Preprocessors
• C File Handling
• C Cheatsheet
• C Interview Questions

C Exercises - Practice Questions with Solutions for C Programming

The best way to learn C programming language is by hands-on practice. This C Exercise page contains the top 30 C exercise questions with solutions that are designed for both beginners and advanced programmers. It covers all major concepts like arrays, pointers, for-loop, and many more.

So, Keep it Up! Solve topic-wise C exercise questions to strengthen your weak topics.

Also, Once you've covered basic C exercises, the GeeksforGeeks Practice Platform is a great place to take on more advanced C coding problems and improve your understanding.

C Programming Exercises

The following are the top 30 programming exercises with solutions to help you practice online and improve your coding efficiency in the C language. You can solve these questions online in GeeksforGeeks IDE.

Q1: Write a Program to Print "Hello World!" on the Console.

In this problem, you have to write a simple program that prints "Hello World!" on the console screen.

For Example,

Click here to view the solution.

Q2: write a program to find the sum of two numbers entered by the user..

In this problem, you have to write a program that adds two numbers and prints their sum on the console screen.

Q3: Write a Program to find the size of int, float, double, and char.

In this problem, you have to write a program to print the size of the variable.

Q4: Write a Program to Swap the values of two variables.

In this problem, you have to write a program that swaps the values of two variables that are entered by the user.

Q5: Write a Program to calculate Compound Interest.

In this problem, you have to write a program that takes principal, time, and rate as user input and calculates the compound interest.

Q6: Write a Program to check if the given number is Even or Odd.

In this problem, you have to write a program to check whether the given number is even or odd.

Q7: Write a Program to find the largest number among three numbers.

In this problem, you have to write a program to take three numbers from the user as input and print the largest number among them.

Q8: Write a Program to make a simple calculator.

In this problem, you have to write a program to make a simple calculator that accepts two operands and an operator to perform the calculation and prints the result.

Q9: Write a Program to find the factorial of a given number.

In this problem, you have to write a program to calculate the factorial (product of all the natural numbers less than or equal to the given number n) of a number entered by the user.

Q10: Write a Program to Convert Binary to Decimal.

In this problem, you have to write a program to convert the given binary number entered by the user into an equivalent decimal number.

Q11: Write a Program to print the Fibonacci series using recursion.

In this problem, you have to write a program to print the Fibonacci series(the sequence where each number is the sum of the previous two numbers of the sequence) till the number entered by the user using recursion.

Q12: Write a Program to Calculate the Sum of Natural Numbers using recursion.

In this problem, you have to write a program to calculate the sum of natural numbers up to a given number n.

Q13: Write a Program to find the maximum and minimum of an Array.

In this problem, you have to write a program to find the maximum and the minimum element of the array of size N given by the user.

Q14: Write a Program to Reverse an Array.

In this problem, you have to write a program to reverse an array of size n entered by the user. Reversing an array means changing the order of elements so that the first element becomes the last element and the second element becomes the second last element and so on.

Q15: Write a Program to rotate the array to the left.

In this problem, you have to write a program that takes an array arr[] of size N from the user and rotates the array to the left (counter-clockwise direction) by D steps, where D is a positive integer. 

Q16: Write a Program to remove duplicates from the Sorted array.

In this problem, you have to write a program that takes a sorted array arr[] of size N from the user and removes the duplicate elements from the array.

Q17: Write a Program to search elements in an array (using Binary Search).

In this problem, you have to write a program that takes an array arr[] of size N and a target value to be searched by the user. Search the target value using binary search if the target value is found print its index else print 'element is not present in array '.

Q18: Write a Program to reverse a linked list.

In this problem, you have to write a program that takes a pointer to the head node of a linked list, you have to reverse the linked list and print the reversed linked list.

Q18: Write a Program to create a dynamic array in C.

In this problem, you have to write a program to create an array of size n dynamically then take n elements of an array one by one by the user. Print the array elements.

Q19: Write a Program to find the Transpose of a Matrix.

In this problem, you have to write a program to find the transpose of a matrix for a given matrix A with dimensions m x n and print the transposed matrix. The transpose of a matrix is formed by interchanging its rows with columns.

Q20: Write a Program to concatenate two strings.

In this problem, you have to write a program to read two strings str1 and str2 entered by the user and concatenate these two strings. Print the concatenated string.

Q21: Write a Program to check if the given string is a palindrome string or not.

In this problem, you have to write a program to read a string str entered by the user and check whether the string is palindrome or not. If the str is palindrome print 'str is a palindrome' else print 'str is not a palindrome'. A string is said to be palindrome if the reverse of the string is the same as the string.

Q22: Write a program to print the first letter of each word.

In this problem, you have to write a simple program to read a string str entered by the user and print the first letter of each word in a string.

Q23: Write a program to reverse a string using recursion

In this problem, you have to write a program to read a string str entered by the user, and reverse that string means changing the order of characters in the string so that the last character becomes the first character of the string using recursion. 

Q24: Write a program to Print Half half-pyramid pattern.

In this problem, you have to write a simple program to read the number of rows (n) entered by the user and print the half-pyramid pattern of numbers. Half pyramid pattern looks like a right-angle triangle of numbers having a hypotenuse on the right side.

Q25: Write a program to print Pascal’s triangle pattern.

In this problem, you have to write a simple program to read the number of rows (n) entered by the user and print Pascal’s triangle pattern. Pascal’s Triangle is a pattern in which the first row has a single number 1 all rows begin and end with the number 1. The numbers in between are obtained by adding the two numbers directly above them in the previous row.

Q26: Write a program to sort an array using Insertion Sort.

In this problem, you have to write a program that takes an array arr[] of size N from the user and sorts the array elements in ascending or descending order using insertion sort.

Q27: Write a program to sort an array using Quick Sort.

In this problem, you have to write a program that takes an array arr[] of size N from the user and sorts the array elements in ascending order using quick sort.

Q28: Write a program to sort an array of strings.

In this problem, you have to write a program that reads an array of strings in which all characters are of the same case entered by the user and sort them alphabetically. 

Q29: Write a program to copy the contents of one file to another file.

In this problem, you have to write a program that takes user input to enter the filenames for reading and writing. Read the contents of one file and copy the content to another file. If the file specified for reading does not exist or cannot be opened, display an error message "Cannot open file: file_name" and terminate the program else print "Content copied to file_name"

Q30: Write a program to store information on students using structure.

In this problem, you have to write a program that stores information about students using structure. The program should create various structures, each representing a student's record. Initialize the records with sample data having data members' Names, Roll Numbers, Ages, and Total Marks. Print the information for each student.

We hope after completing these C exercises you have gained a better understanding of C concepts. Learning C language is made easier with this exercise sheet as it helps you practice all major C concepts. Solving these C exercise questions will take you a step closer to becoming a C programmer.

Frequently Asked Questions (FAQs)

Q1. what are some common mistakes to avoid while doing c programming exercises.

Some of the most common mistakes made by beginners doing C programming exercises can include missing semicolons, bad logic loops, uninitialized pointers, and forgotten memory frees etc.

Q2. What are the best practices for beginners starting with C programming exercises?

Best practices for beginners starting with C programming exercises: Start with easy codes Practice consistently Be creative Think before you code Learn from mistakes Repeat!

Q3. How do I debug common errors in C programming exercises?

You can use the following methods to debug a code in C programming exercises Read the error message carefully Read code line by line Try isolating the error code Look for Missing elements, loops, pointers, etc Check error online

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100+ C Language Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Business Administration in Computer Applications (BBA [CA]) .

• Introduction to C Language
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C Programming Language MCQs

C is a general-purpose, procedural computer programming language, C language supports structured programming, lexical variable scope, and recursion, with a static type system. C language is used to develop software like operating systems, databases, compilers, and so on.

C language MCQs : This section contains multiple-choice questions and answers on the C programming language . It will help the students to test their skills and prepare well for their exams.

List of C programming MCQs

• C Basics MCQs
• C Data Types, Operators and Expressions MCQs

C Conditional Statements MCQs

• C Control Statements MCQs
• C Strings MCQs
• C Arrays MCQs
• C Structures and Union MCQs
• C Functions MCQs
• C Pointers MCQs
• C File Handling MCQs
• C Preprocessor MCQs

1) C Basics MCQs

1. c language was developed by ___..

• Dennis Rechard
• Dennis M. Ritchie
• Bjarne Stroustrup
• Anders Hejlsberg

B) Dennis M. Ritchie

Explanation

C programming language was developed by an American computer scientist Dennis M. Ritchie at Bell Laboratories (formerly AT&T Bell Laboratories).

2. In which year was C language developed?

C programming language was developed by Dennis Ritchie at Bell Laboratories in 1972.

3. C language is a successor to which language?

C programming language is a successor to the programming language B.

4. C is a ___.

• Low level language
• High level language
• Medium level language
• None of the above

C) Medium level language

C is a medium-level language because it contains the features of low-level language as well as high-level language.

5. How many keywords are there in C language?

C language has only 32 keywords.

6. C language is a ___.

• Procedural oriented programming language
• General purpose programming language
• Structured programming
• All of the above

D) All of the above

C programming language is a general-purpose, procedural computer programming language that supports structured programming also.

7. Which is not a valid keyword in C language?

C) do-while

do-while is not a valid keyword in the C programming language. It's a control statement. 'do' and 'while' are the separate keywords. The rest of all 'for', 'while', and 'switch' are the valid keywords in C.

8. What is an identifier in C language?

• An identifier is a combination of alphanumeric characters used for conditional and control statements
• An identifier is a combination of alphanumeric characters used for any variable, function, label name
• Both A and B

B) An identifier is a combination of alphanumeric characters used for any variable, function, label name

An identifier is a combination of alphanumeric characters used for any variable, function, label name. An identifier is a name that is used to identify the variables/ constants, functions, arrays, label name, and user-defined data.

9. A C-style comment, simply surround the text with ___.

• /** and **/

A) /* and */

A C-style comment , simply surround the text with /* and */.

10. Can we place comments between the statement to comments a part of the code?

Yes, we can place comments between the statement to comments a part of the code.

11. ___ is an informal name for ISO/IEC 9899:1999, a past version of the C programming language standard?

C99 is an informal name for ISO/IEC 9899:1999, a past version of the C programming language standard.

12. In which version of C language, the C++ Style comment (//) are introduced?

C language version C99 introduced C++ style comment (//), they can be used to comment a single line.

13. The C source file is processed by the ___.

• Interpreter
• Both Interpreter and Compiler

B) Compiler

The C source file is processed by the compiler.

14. How many whitespace characters are allowed in C language?

There are 5 whitespace characters are allowed in C language, they are:

• Horizontal tab
• Vertical tab

15. How many punctuation characters are allowed in C language?

There are 29 punctuation characters are allowed in C language, they are:

16. What is the extension of a C language source file?

The extension of a C language source file is ".c".

17. What is the extension of a C language header file?

The extension of a C language source file is ".h".

18. To develop which operating, C language was invented?

C language was invented to develop Unix operating system.

19. Does C language support object-oriented approach?

C language does not support object-oriented approach.

20. Which is/are the disadvantage(s) of C language?

• No Garbage Collection
• Inefficient Memory Management
• Low level of abstraction
• Lack of Object Orientation

E) All of the above

The main disadvantages of C language are:

2) C Data Types, Operators and Expressions MCQs

21. which are the fundamental data types in c.

The fundamental / basic data types in C language :

22. How many byte(s) does a char type take in C?

The char data type takes one byte in the memory.

23. For which type, the format specifier "%i" is used?

In C programming language, both of the format specifier %d and %i are used for int type, where %d specifies the type of variable as decimal and %i specifies the type as integer.

24. What is the difference between float and double in C?

• both are used for the same purpose
• double can store just double value as compare to float value
• double is an enhanced version of float and was introduced in C99
• double is more precise than float and can store 64 bits

D) double is more precise than float and can store 64 bits

In C programming language, the double is more precise than float and can store 64 bits.

25. Which is the correct format specifier for double type value in C?

The %lf is used to represent a double type value in C programming language.

26. The short type represents ___.

• unsigned int

C) unsigned int

The short type represents short int in C language.

27. How many byte(s) does a short type take in C?

In C programming language, the short or short int takes 2 bytes (16 bits) in memory.

28. What is the correct syntax to declare a variable in C?

• data_type variable_name;
• data_type as variable_name;
• variable_name data_type;
• variable_name as data_type;

A) data_type variable_name;

In C language, the correct syntax to declare a variable is:

Where, data_type is the type of data (such as int , char , float , etc) and variable_name is a valid identifier . For example: int age;

29. How many types of qualifiers are there in C language?

There are 3 types of qualifiers in C language, they are:

• Size qualifiers
• Sign qualifiers
• Type qualifiers

30. Which is/are the size qualifier(s) in C language?

• Both A. and B

D) Both A. and B.

The size qualifiers are short and long .

31. Which is/are the sign qualifier(s) in C language?

The sign qualifiers are used to specify the signed nature of an integer type. The sign qualifiers are signed and unsigned .

32. Which is/are the type qualifier(s) in C language?

The type qualifiers are const and "volatile".

33. Which is correct with respect to the size of the data types in C?

• char > int > float
• char < int < float
• int < char < float
• int < chat > float

B) char < int < float

The correct order of the data types as per the size is: char < int > float .

34. Which operator is used to find the remainder of two numbers in C?

The % operator is known as "Modulus Operator" and it is used to find the remainder of two numbers.

35. Which of the following is not an arithmetic expression?

x != 10 is not a valid arithmetic expression.

36. What will be the output of the following C code?

In the above code, the value of x is 20 and then in the next statement, the expression is x %= 3 . That will be evaluate as:

37. What will be the output of the following C code?

In the above code, we are performing modulus operation with float values. Modulus operator doesn't work with float and double operands. Thus, the output will be:

38. What will be the output of the following C code?

In the above code, the value of x is 23.456 and we are printing the value of x using the %.2f format specifier. %.2f rounds the value and prints the 2 digits after the decimal point.

39. What will be the output of the following C code?

In the above code, we are using a post-increment statement ( x++ ), post-increment increases the value after evaluating the current expression. Thus, the value of y will be 30 and then x will be 11.

40. Increment (++) and decrement (--) are the ___ operators in C?

Increment (++) and decrement (--) are the unary operators. They need one operand to perform the operation.

41. What will be the output of the following C code?

290 is beyond the range of unsigned char . Its corresponding value printed is: (290 % (UCHAR_MAX +1) where UCHAR_MAX represents highest (maximum) value of unsigned char type of variable. The value of UCHAR_MAX=255. Thus it prints 290 % (UCHAR_MAX+1)=34

42. What will be the output of the following C code?

Bitwise OR operator (|) has precedence over logical OR operator (||). Thus the expression 5 || 2 | 1 is actually 5 || (2 |1).

43. What will be the output of the following C code?

The statement "-100;" is evaluated and this does not affect the value of "x".

44. What will be the output of the following C code?

0x10 is hex value it's decimal value is 16 and 010 is an octal value it's decimal value is 8, hence answer will be 24.

45. Which C keyword is used to extend the visibility of variables?

The "extern: keyword used to define an extern variable , that can be accessed in any source file. i.e., extern is used to extend the visibility of variables in C language.

46. What is the name of "&" operator in C?

C) Address of

The " & " operator is known as 'Address Of' operator which is used to access the address of a variable.

47. Which of the following are valid decision-making statements in C?

• All of these

D) All of these

All valid decision-making statements in C program are:

• if statement
• if-else statement
• nested if statement
• switch statement
• nested switch statement

48. Decision making in the C programming language is ___.

• Repeating the same statement multiple times
• Executing a set of statements based on some condition
• Providing a name of the block of code

B) Executing a set of statements based on some condition

Decision-making in C programming is executing a block of code to be executed by the program based on some condition.

49. Which of the following is a true value in C programming?

• "includehelp"

All non-zero and non-null values in C programming are true.

50. Ternary operator in C programming is ___.

• None of these

Ternary operator is used to execute expressions based on the given condition.

51. What will be the output of the following C code?

• value 1 is not greater
• value 1 is greater

A) value 1 is not greater

52. What is the correct syntax of if statement in C program?

• if(condition){ }
• if(condition) :
• If { [condition] }

The correct syntax of if statement in C program is:

53. The if statement is a conditional statement?

The if statement is a conditional statement, i.e., the block is executed based on the given condition.

54. When the condition of if statement is false, the flow of code will ___.

• go into the if block
• Exit the program
• Continue the code after skipping the if block

C) Continue the code after skipping the if block

When the condition of if statement is false, the code after the if block will be executed and the if block code is skipped.

55. What will be the result of the following condition?

56. which statement is required to execute a block of code when the condition is false.

In the if-else block, the if block is executed when condition is True and else block is executed when condition is false.

57. Can the else statement exist without the if statement in C?

The else statement needs an if statement to execute the block.

58. Which of these if...else block syntax is correct?

• if(condition){ } else { }
• if(condition){ } else(condition){ }
• if{ } else { }

The syntax of if...else block of code in C is:

59. The if-elseif-else statement in C programming is used?

• Create multiple conditional statements
• Return values
• Loop in if-else block

A) Create multiple conditional statements

The if-elseif-else statement is a statement which contains multiple statements based on conditions.

60. What will be the output of the following C code?

D) Grade : D

61. How many expressions can be checked using if...elseif...else statement?

C) Infinite

You can execute any number of expressions using if-elseif-else statements, each elseif statement containing one condition.

62. Is it possible to nest if-else statements in C programming?

Nesting of if-else statements in C programming is possible.

63. Which of the following syntax is correct for nested if-else statements?

• if(exp1){ if(exp2){ } } else { if(exp3){ } }
• if(exp1){ }else { }

The correct syntax for nested if-else statements in C programming is:

64. What will be the output of the following C code?

65. multiple values of the same variable can be tested using ___..

The switch statement in C is used to test for multiple values of a variable.

66. Without a break statement in switch what will happen?

• All cases will work properly
• Cases will fall through after matching the first check
• Switch will throw error

B) Cases will fall through after matching the first check

The break statement is used to terminate the current flow of code. And if it is not present in the switch statement, the cases will execute all cases after the matched case.

67. When all cases are unmatched which case is matched in a switch statement?

• Default case

A) Default case

The default case of switch statement is executed when no other case is matched.

68. What will be the output of the following C code?

• Better try again

There is no break statement in case B, Case C, case D. the code will fall through executing all the print statements.

4) C Control Statements MCQs

69. loops in c programming are used to ___..

• Execute a statement based on a condition
• Execute a block of code repeatedly
• Create a variable

B) Execute a block of code repeatedly

Loops in programming are used to execute a block of code repeatedly.

70. Which of these is an exit-controlled loop?

C) do...while

The do...while loop check for a condition after executing the loop block once. Hence, it is called an exit-controlled loop.

71. Which statements are used to change the execution sequence?

• Loop control statement
• Function statement
• Conditional statement

A) Loop control statement

Loop control statements in C are used to change the execution sequence of the loop.

72. What will happen if the loop condition will never become false?

• Program will throw an error
• Program will loop infinitely
• Loop will not run

B) Program will loop infinitely

An infinite loop in a program is a condition when the loop continues when the loop continues to run infinitely because the condition never becomes false.

73. Which of these statements is correct in case of while loop in C?

• Executes the block till the condition become false
• Is an entry controlled loop
• There might be condition when the loop will not execute at all

All of the above statements are true in the case of while loop. While loop is an entry-controlled loop, the block executes when the condition becomes false.

74. Which of the following is valid syntax for creating a while loop?

• while{ } (condition)
• while(condition){ }

The correct syntax for creating a while loop is:

75. What will be the output of the following C code?

• 11 13 15 17 19
• 11 12 13 14 15 16 17 18 19 20
• 11 13 15 17 19 21

A) 11 13 15 17 19

76. Which loop executes the block a specific number of times?

• do...while loop

B) for loop

The for loop executes the block a specific number of times.

77. Which of the following parts of the for loop can be eliminated in C?

Syntax of for loop:

Inside the initialization statement (init), any of the three init or condition or increment can be eliminated i.e., all are optional. The loop can work without them also.

78. When all parts of the for loop are eliminated, what will happen?

• For loop will not work
• Infinite for loop

B) Infinite for loop

On eliminating all the parts of a for loop an infinite for loop will run.

79. When the condition of the do-while loop is false, how many times will it execute the code?

The do-while loop is an exit-controlled loop, hence it will run at least once, even if the condition becomes false.

80. Can a loop be nested in C programming?

Yes, the nesting of loop is possible in C programming language.

81. What will be the output of the following C code?

• 2 3 4 5 6 7 8 9

5) C Strings MCQs

82. a string is terminated by ___..

• Newline ('\n')
• Null ('\0')

B) Null ('\0')

In C programming language, a string is a sequence of characters terminated with a null character \0.

83. Consider the below statement, can we assign a string to variable like this:

No, we cannot assign a string like this. Because string is a character array and array type is not assignable. To assign a string to the character array, we need to use strcpy() function.

84. Which format specifier is used to read and print the string using printf() and scanf() in C?

The format specifier "%s" is used to read and print the string using printf() and scanf() in C.

85. Which function is used to read a line of text including spaces from the user in C?

In C programming language, the fgets() function can be used to read a line of text including spaces from the user.

86. Which function is used to concatenate two strings in C?

• stringcat()

D) strcat()

In C programming language, the strcat() function is used to concatenate two strings.

This function concatenates string s2 onto the end of string s1.

87. What will be the output of the following C code?

str1 is initialized with the characters and there are only 5 characters. Thus, the length of the str is 5. While, str2 is initialized with the string "Hello", when we initialized the string in this way - a null ('\0') character is inserted after the string. Thus, the length of str2 is 6.

88. What will be the output of the following C code?

• Hello,Hello
• Hello,HelloHello

There will be a compilation error, because we cannot assign a string like this (str2 = str1). To resolve this issue, we have to use strcpy(str2,str1).

The output will be:

89. What will be the output of the following C code? (If the input is "Hello world")

• Hello world
• Hello world\0

When we read a string using the scanf() function, the input is terminated by the whitespace. Here, the input is "Hello world", so only "Hello" will be stored to str . Thus, the output will be "Hello".

90. Which function is used to compare two strings in C?

A) strcmp()

The function strcmp() is used to compare two strings in C language.

The strcmp() is a built-in library function and is declared in <string.h> header file . This function takes two strings as arguments and compare these two strings lexicographically.

91. Which function is used to compare two strings with ignoring case in C?

B) strcmpi()

The function strcmpi() is used to compare two strings with ignoring case in C language.

The strcmpi() is a built-in library function and is declared in <string.h> header file. This function takes two strings as arguments and compare these two strings, it is similar to strcmp() function but the only difference is that strcmpi() function is not case sensitive.

6) C Arrays MCQs

92. which is the correct syntax to declare an array in c.

• data_type array_name[array_size];
• data_type array_name{array_size};
• data_type array_name[];

A) data_type array_name[array_size];

The correct syntax to declare an array in C is:

93. You can access elements of an array by ___.

• memory addresses

You can access elements of an array by indices. Array indices starts from 0 to array_size -1.

94. Which is/are the correct syntax to initialize an array in C?

• data_type array_name[array_size] = {value1, value2, value3, …};
• data_type array_name[] = {value1, value2, value3, …};
• data_type array_name[array_size] = {};

D) Both A and B

Both the options A and B are correct to initialize an array.

95. Array elements are always stored in ___ memory locations.

B) Sequential

Array elements are always stored in sequential memory locations.

96. Let x is an integer array with three elements having value 10, 20, and 30. What will be the output of the following statement?

• Prints the value of 0 th element (i.e., 10)
• Prints the garbage value
• An error occurs
• Print the address of the array (i.e., the address of first (0 th ) element

D) Print the address of the array (i.e., the address of first (0 th ) element

If we print the array (in this case, x). The output will be the memory address of the array (i.e., the address of first (0 th ) element.

97. What will be the output of the following C program?

• Garbage value

In C language, when an array is partially initialized at the time of declaration then the remaining elements of the array is initialized to 0 by default.

98. What will be the output of the following C program?

C) Garbage value

C language compiler does not check array with its bounds, when an index is out of the range the garbage value is printed.

99. What will be the output of the following C program?

The statement sizeof(x)/sizeof(x[0]) can be used to get the total numbers of elements, sizeof(x) will return the size of array while sizeof(x[0]) will return the size of first element i.e., size of the type. Their division will return the total number of elements.

100. What will be the output of the following C program?

101. what will be the output of the following c program, 102. if we pass an array as an argument to a function, what actually gets passed.

• Value of elements in array
• First element of the array
• Base address of the array i.e., the address of the first element
• Address of the last element of array

C) Base address of the array i.e., the address of the first element

If we pass an array as an argument to a function – the base address of the array (the address of the first element) is passed to the function.

7) C Structures and Union MCQs

103. which of the following is the collection of different data types.

A) structure

In C programming language, a structure is a user-defined data type which is the collection of different data types.

104. Which operator is used to access the member of a structure?

The dot (.) operator is used to access the member of a structure.

105. Which of these is a user-defined data type in C?

Union is a user defined data type in C.

106. "A union can contain data of different data types". True or False?

Union is a user defined data structure which can store data variables of different data types.

107. Which keyword is used to define a union?

The union is defined using the keyword union.

108. The size of a union is ___.

• Sum of sizes of all members
• Predefined by the compiler
• Equal to size of largest data type

C) Equal to size of largest data type

The size of the union is equal to the size of the largest data type declared in the union.

109. All members of union ___.

• Stored in consecutive memory location
• Share same memory location
• Store at different location

B) Share same memory location

All members of a union in C are stored at the same memory location.

110. Which of the below statements is incorrect in case of union?

• Union is a user-defined data structure
• All data share same memory
• Union stores methods too
• union keyword is used to initialize

C) Union stores methods too

Unions in C is a data structure which store data types but not the methods.

111. The members of union can be accessed using ___.

• Dot Operator (.)
• And Operator (&)
• Asterisk Operator (*)
• Right Shift Operator (>)

A) Dot Operator (.)

The dot operator (.) is used to access members of a union.

112. In which case union is better than structure?

• Less memory is available
• Faster compilation is required
• When functions are included

A) Less memory is available

113. Which is the correct syntax to create a union?

• union union_name { };
• union union_name { }
• union union_name ( );
• Union union_name ( )

The correct syntax of creating a union is:

114. What will be the output of the following C program?

• val1 = 0x54ac88dd2012 val2 = 0x55ac76dd2014
• val1 = 0x55ac76dd2014 val2 = 0x55ac76dd2014

C) val1 = 0x55ac76dd2014 val2 = 0x55ac76dd2014

8) C Functions MCQs

115. what is a function in c.

• User defined data type
• Block of code which can be reused
• Declaration syntax

B) Block of code which can be reused

Function in C is a block of code which can be reused.

116. Functions in C can accept multiple parameters. True or False?

Functions in C programming can accept multiple parameters.

117. Which keyword is used to return values from function?

• Return type

C) Return type

The return in declaration is initialized using return type.

118. Which of these is not a valid parameter passing method in C?

• Call by value
• Call by reference
• Call by pointer

C) Call by pointer

Valid parameter passing method in C is:

119. A C program contains ___.

• At least one function
• No function
• No value from command line

A) At least one function

The main() function is required in the C program.

120. A recursive function in C ___.

• Call itself again and again
• Loop over a parameter
• Return multiple values

A) Call itself again and again

Recursive function in C is a function which calls itself again and again.

121. The scope of a function is limited to?

• Current block
• Only function

C) Whole file

The scope of a function is limited to the file it is declared in.

122. Which of the below syntax is the correct way of declaring a function?

• return function_name () { }
• data_type function_name (parameter) { }
• Void function_name ( )

The correct syntax of declaring a function in C:

123. The sqrt() function is used to calculate which value?

• Square of reverse bits
• Square root

C) Square root

The sqrt() method in C is used to calculate the square root of a number.

124. What will be the output of the following C program?

9) c pointers mcqs, 125. before using a pointer variable, it should be ___..

• Initialized
• Both A. and B.

C) Both A. and B.

A pointer variable should be declared and initialized before the using.

126. An uninitialized pointer in C is called ___.

• Void pointer
• Empty pointer
• Invalid pointer
• Wild pointer

D) Wild pointer

An uninitialized pointer in C is called wild pointer. Since, the pointer is initialized it may lead a program to behave wrongly or to crash.

127. ___ is a pointer that occurs at the time when the object is de-allocated from memory without modifying the value of the pointer.

• Dangling pointer
• Null pointer

A) Dangling pointer

A dangling pointer is a pointer that occurs at the time when the object is de-allocated from memory without modifying the value of the pointer.

128. A ___ can be assigned the address of any data type.

C) Void pointer

A void pointer can be assigned the address of any data type.

129. Which pointer is called general-purpose pointer?

A void pointer is called general-purpose, because it can be used with any type of variable.

130. Pointer arithmetic is not possible on ___.

• Integer pointers
• Float pointers
• Character pointers
• Void pointers

D) Void pointers

Pointer arithmetic is not possible on void pointers due to lack of concrete value and size.

131. Comment on the following pointer declaration?

• p is a pointer to integer, x is not
• p and x, both are pointers to integer
• p is pointer to integer, x may or may not be
• p and x both are not pointers to integer

A) p is a pointer to integer, x is not

In the above given statement, variable p is a pointer to integer, while x is an integer variable.

132. What will be the output of the following C code?

• A garbage value

In the above program, x contains 10 and ptr is a pointer to x . We are changing the value of x with the help of pointer. Thus, the value will be changed and it will be 20.

133. What will be the output of the following C code?

• IncludeHelp
• Some address

In the above program, in printf statement – we are using two symbols those are * and &. The * is a dereference operator, and the & is a reference operator. These symbols can be used any number of times. Here ptr points to the first character in the string "IncludeHelp". *ptr dereferences it and so its value is I. Again & references it to an address and * dereferences it to the value I.

134. What is the correct syntax to declare pointer to pointer i.e., double pointer?

• type **pointer_name;
• type *&pointer_name;
• type *(*pointer_name);
• type **(pointer_name);

A) type **pointer_name;

The correct syntax syntax to declare pointer to pointer i.e., double pointer is:

135. What is ptr in the given statement?

• ptr is an array of 5 pointers
• ptr is a simple integer array
• ptr is a pointer to a 5 elements integer array

C) ptr is a pointer to a 5 elements integer array

In the above statement, ptr is a pointer to a 5 elements integer array.

136. What is the correct syntax to declare a pointer to a constant?

• const type *pointer_name;
• type const *pointer_name;

A) const type *pointer_name;

The correct syntax to declare a pointer to a constant is:

10) C File Handling MCQs

137. which function is used to open a file in c.

• file_open()

In C programming language, the fopen() function is used to open a file.

Where, fileopen is the name of the file, and mode is the mode of the file.

138. Which character(s) is/are used to open a binary file in append mode in C?

The characters "ab" opens a binary file in append mode.

139. Which character(s) is/are used to open a binary file in reading and writing mode in C?

The characters "rb+" opens a binary file in reading and writing mode.

140. Which is the correct syntax to declare a file pointer in C?

• File *file_pointer;
• FILE *file_pointer;
• File file_pointer;

B) FILE *file_pointer;

The correct syntax to declare a file pointer in C is:

141. Which function is used to close an opened file in C?

• file_close()
• fileclose()

B) fclose()

In C programming language, the fclose() function is used to close an opened file.

142. Function fwrite() works with ___.

• Binary files

B) Binary files

Function fwrite() works with binary files. The file should be opened/created in binary mode.

143. What is the value of EOF in C?

The EOF stands for End of File which is a Macro defined in stdio.h header file. With the GNU C Library, EOF is -1. In other libraries, its value may be some other negative number.

144. Which function checks the end-of-file indicator for the given stream in C?

The C library function feof() checks the end-of-file indicator for the given stream.

145. Which function is used to seek the file pointer position in C?

In C programming language, the fseek() function is used to seek the file pointer position.

• file_pointer− This is the pointer to a FILE object that identifies the stream.
• offset − This is the number of bytes to offset from whence.
• whence − This is the position from where offset is added, the value of this parameter may SEEK_SET, SEEK_CUR, or SEEK_END.

146. Which function is used to delete an existing file in C?

D) remove()

In C programming language, the remove() function is used to delete an existing file.

Where, filename is the name of the file to be removed.

11) C Preprocessor MCQs

147. what is cpp in c programming.

• C processing platform
• C PreProcessor
• C pre-platform

B) C PreProcessor

In C programming, C preprocessors are referred to as CPP.

148. Which symbol is used to begin a preprocessor?

All preprocessor commands begin with a hash symbol (#).

149. Which of these is a valid preprocessor in C?

150. (\) operator in c is ___..

• Macro continuation operator
• Stringize operator

A) Macro continuation operator

Macro continuation (/) operator is used to continue a macro which is too long for a single line.

151. Which operator is used to stringize variables in C?

# Operator is used to stringize variables in C .

152. What will be the output of the following C code?

• Learn python programming language at includehelp
• Learn #a programming language at #b
• Learn programming language at

A) Learn python programming language at includehelp

153. Is it possible in a C program to merge two tokens into one token?

The ### preprocessor in C is used to merge two tokens to one.

154. Which of these is not a valid preprocessor in C?

\ and ### are both valid preprocessors in C.

155. Header files ___.

• Contain function declarations
• Can be included to a program
• End with .h extension

All statements are correct. The header files are special files included in a program that contain functions and macros which can be imported and used in the code. The extension of header files is ".h".

156. Can programmers create their own header files?

A header file can be created by a programmer with some function that she needs to use in other files as well.

157. Which of these is valid syntax to include a header in C?

• #include <header>
• #include "header"

C) Both A and B

The valid syntaxes to include a header file to a program in C are:

158. What will happen if a header file is included in a program twice?

• Program will throw an exception
• Program will run normally

A) Program will throw an error

When the same header is included twice in the program, the compiler will throw an error as its teens to process it twice.

159. Which syntax is correct to include a specific preprocessor based on configuration?

• #defif system1 <system.h>
• #include system1 "system.h"
• import <system.h> if system1

B) #include system1 "system.h"

The correct way to include a specific preprocessor based on configuration is known as computed include is:

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• 100 Multiple Choice Questions In C Programming – Part 1

T his collection of 100 Multiple Choice Questions and Answers (MCQs) In C Programming : Quizzes & Practice Tests with Answer focuses on “C Programming”.  

1. A preprocessor directive is a statement that begins with_____

• Incorporation of source files (#include),
• Definition of symbolic constants and macros (#define),
• Conditional compilation (#if, #ifdef,…).

2. Which character always ends a statement?

3. how to write a comment on a single line.

A /* my comment

B // my comment //

C // my comment

D /* my comment */

If your comment is long, type your comment between (/* and */). For example:

4. What is a library?

A A source file already written containing ready-made functions

B A file allowing to display text on the screen

C A file containing my program

D None of the above

5. What is the name of the main function of a C program?

A principal

6. Which of the following functions display “Hello, World!” on the screen in console mode?

A echo("Hello, World!");

B print("Hello, World!");

C printf("Hello, World!");

D show("Hello, World!");

7. Which of the following characters is used to make a line break on the screen?

8. which of the following characters returns the cursor to the left of the screen, 9. what kind of files can be created with c programming.

A Images (*.jpg, *.png, *.gif…)

B Executables (*.exe on Windows)

C Sources (*.c)

D Text files (*.txt)

10. The program that translates your code from a high-level language to the binary language is called ________

A programmer

C translator

100 Multiple Choice Questions In C Programming – Part 2

• 100 Multiple Choice Questions In C Programming – Part 3
• 100 Multiple Choice Questions In C Programming – Part 4
• 100 Multiple Choice Questions In C Programming – Part 5

100 Multiple Choice Questions In C Programming – Part 6

100 multiple choice questions in c programming – part 7.

• 100 Multiple Choice Questions In C Programming – Part 8
• 100 Multiple Choice Questions In C Programming – Part 9
• 100 Multiple Choice Questions In C Programming – Part 10
• 100 Multiple Choice Questions In C Programming – Part 11
• 100 Multiple Choice Questions In C Programming – Part 12
• 100 Multiple Choice Questions In C Programming – Part 13
• 100 Multiple Choice Questions In C Programming – Part 14
• HTML/CSS MCQs – Multiple Choice Questions and Answers – Part 5

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• C Programming Tutorial
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• C - Ternary Operator
• C - sizeof Operator
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• C - Misc Operators
• Decision Making in C
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• C - if statement
• C - if...else statement
• C - nested if statements
• C - switch statement
• C - nested switch statements
• C - While loop
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• C - Functions
• C - Main Function
• C - Function call by Value
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• C - Static Variables
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• C - Pointers
• C - Pointers and Arrays
• C - Applications of Pointers
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• C - Pointer to Pointer
• C - Passing Pointers to Functions
• C - Return Pointer from Functions
• C - Function Pointers
• C - Pointer to an Array
• C - Pointers to Structures
• C - Chain of Pointers
• C - Pointer vs Array
• C - Character Pointers and Functions
• C - NULL Pointer
• C - void Pointer
• C - Dangling Pointers
• C - Dereference Pointer
• C - Near, Far and Huge Pointers
• C - Initialization of Pointer Arrays
• C - Pointers vs. Multi-dimensional Arrays
• Strings in C
• C - Strings
• C - Array of Strings
• C - Special Characters
• C Structures and Unions
• C - Structures
• C - Structures and Functions
• C - Arrays of Structures
• C - Self-Referential Structures
• C - Lookup Tables
• C - Dot (.) Operator
• C - Enumeration (or enum)
• C - Structure Padding and Packing
• C - Nested Structures
• C - Anonymous Structure and Union
• C - Bit Fields
• C - Typedef
• File Handling in C
• C - Input & Output
• C - File I/O (File Handling)
• C Preprocessors
• C - Preprocessors
• C - Pragmas
• C - Preprocessor Operators
• C - Header Files
• Memory Management in C
• C - Memory Management
• C - Memory Address
• C - Storage Classes
• Miscellaneous Topics
• C - Error Handling
• C - Variable Arguments
• C - Command Execution
• C - Math Functions
• C - Static Keyword
• C - Random Number Generation
• C - Command Line Arguments
• C Programming Resources
• C - Questions & Answers
• C - Quick Guide
• C - Cheat Sheet
• C - Useful Resources
• C - Discussion
• Selected Reading
• UPSC IAS Exams Notes
• Developer's Best Practices
• Questions and Answers
• Effective Resume Writing
• HR Interview Questions
• Computer Glossary

C Programming - Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to C Programming Framework . You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - What is the output of the below code snippet?

C - Compile error

Explanation

2.30, addition is valid and after decimal with is specified for 2 places.

Q 2 - The type name/reserved word ‘short’ is ___

A - short long

B - short char

C - short float

D - short int

short is used as an alternative of short int.

Q 3 - Special symbol permitted with in the identifier name.

The only permitted special symbol is under score (_) in the identifier.

Q 4 - What is the output of the following program?

*a refers to 10 and adding a 1 to it gives 11.

Q 5 - What is the output of the following program?

D - Runtime error

Loop continues until *s not equal to ‘\0’, hence printing “Abc” where character is fetched first and address is incremented later.

Q 6 - In Windows & Linux, how many bytes exist for near, far and huge pointers?

A - Near: 1, far: 4, huge: 7

B - near: 4, far: 4, huge: 4

C - near: 0, far: 4, huge: 4

D - near: 4, far: 5, huge: 6

In DOS, numbers of byte exist for near pointer = 2, far pointer = 4 and huge pointer = 4.

In Windows and Linux, numbers of byte exist for near pointer = 4, far pointer = 4 and huge pointer = 4.

Q 7 - A bitwise operator “&” can turn-off a particular bit into a number.

B - &&

The bitwise AND operator “&” compares each bit of the first operand with the corresponding bit of the second operand. During comparison, if both operands bits are 1, the corresponding result bit is set to 1. Otherwise, the corresponding result bit is set to 0.

Q 8 - How many times the given below program will print "IndiaPIN"?

A - Unlimited times

B - 0 times

C - 100 times

D - Till stack run over

A stack over flow comes when over loaded memory is used by the call stack. Here, main()function  is called repeatedly and its return address stores in the stack. When stack memory get filled, it displays the error “stack overflow”.

Q 9 - Which of the following statement shows the correct implementation of nested conditional operation by finding greatest number out of three numbers?

A - max = a>b ? a>c?a:c:b>c?b:c

B - a=b ? c=30;

C - a>b : c=30 : c=40;

D - return (a>b)?(a:b) ?a:c:b

Syntax is exp1?exp2:exp3. Any ‘exp’ can be a valid expression.

Q 10 - In the given below code, what will be the value of a variable x?

C - Print x

D - Return Error

Although, integer y = 100; and constant integer x is equal to y. here in the given above program we have to print the x value, so that it will be 100.