Part-1 C MCQs | C mcq questions and answers | Top 50 MCQs in C

Master the C basics: 50 essential C MCQs with solutions (Part 1).

Think you’re a C master? This test will prove it (or expose your weaknesses!)

C Programming Practice for Beginner

1 / 50

Every line in a C program should end with a semicolon.

True

False

2 / 50

What is the purpose of the strncat function in C?

A. It compares two strings.

B. It concatenates two strings.

C. It copies a specified number of characters from one string to another.

D. It reverses a string.

3 / 50

The underscrore can be used anywhere in an identifer.

True

False

4 / 50

The char data type is used to store single characters, such as 'A' or '5'.

False

True

5 / 50

What is the correct way to include a header file named stdio.h?

a) #include "stdio.h"

b) #include

c) import stdio.h

d) require stdio.h

6 / 50

Which statement is used to execute a block of code at least once?

a) if

b) for

c) while

d) do-while

7 / 50

The keyword void is a data type in C.

True

False

8 / 50

Which function is mandatory in every C program?

a) start()

b) main()

c) run()

d) init()

9 / 50

What is the role of the do-while loop in C?

A. It is used for conditional execution of a block of code.

B. It is used to create an infinite loop.

C. It is used for pre-test loops.

D. It ensures that the loop body is executed at least once.

10 / 50

Which operator is used to increment a variable by 1?

a) ++

b) +=

c) +1

d) inc

11 / 50

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

a) for

b) if

c) while

d) else if

12 / 50

In C, what is the role of the extern keyword?

A. It declares a function.

B. It specifies the data type of a variable.

C. It indicates that a variable is defined elsewhere in the program.

D. It creates a new data type.

13 / 50

The logical AND operator (&&) has higher precedence than the logical OR operator (||).

True

False

14 / 50

ANSI C treat the variables name and Name to be same.

True

False

15 / 50

What is a structure used for?

a) To store a single value of a specific data type

b) To group variables of different data types under a single name

c) To create functions

d) To control program flow

16 / 50

What is the significance of the void keyword in a function declaration?

A. It indicates that the function returns nothing.

B. It signifies that the function accepts no arguments.

C. It declares a variable with no type.

D. It is used to define a generic pointer.

17 / 50

What is the output of printf("%d", 5 + 3);

(a) 5

b) 8

c) 10

d) d

18 / 50

What is the purpose of the strupr function in C?

A. It converts a string to uppercase.

B. It converts a string to lowercase.

C. It reverses a string.

D. It calculates the length of a string.

19 / 50

Which operator is used to access the value at the address pointed to by a pointer?

a) &

b) *

c) ->

d) .

20 / 50

main() is where the program begins its execution.

True

False

21 / 50

The keyword void is a data type in C.

True

False

22 / 50

Only one function may be named main().

False

True

23 / 50

How do you access the third element of an array named numbers?

a) numbers[2]

b) numbers(2)

c) numbers.2

d) numbers->2

24 / 50

What is the purpose of the * operator when used with pointers?

(a) To increment the value of the pointer

(b) To decrement the value of the pointer

d) To compare two pointers

25 / 50

What does a pointer store?

a) The value of a variable

b) The address of a variable

c) The data type of a variable

d) The name of a variable

26 / 50

How do you declare an array of 5 integers?

a) int array[5];

b) int[5] array;

c) array = int[5];

d) array[5] int;

27 / 50

Which operator is used to assign a value to a variable?

a) ==

b) =

c) ->

d) ===

28 / 50

The int data type can store both positive and negative whole numbers.

False

True

29 / 50

What is the correct way to declare a constant in C?

A. const int x = 5;

B. constant x = 5;

C. int const x = 5;

D. int x = const 5;

30 / 50

What is the purpose of the break statement in a switch statement?

A. It ends the execution of the program.

B. It terminates the loop in which it is used.

C. It exits the switch statement and continues with the next statement after it.

D. It skips the current iteration of the loop.

31 / 50

What is the index of the first element in an array?

a) 1

b) 0

c) -1

d) It depends on the array size

32 / 50

The == operator is used for assignment, while the = operator is used for comparison.

True

False

33 / 50

What is the purpose of the return statement in a function?

A. It terminates the program.

B. It skips the remaining code in the function.

C. It returns a value from the function to the calling code.

D. It restarts the function from the beginning.

34 / 50

In C, what is the purpose of the typedef keyword?

A. It creates a new data type.

B. It specifies the type of a variable.

C. It defines a constant.

D. It declares a function.

35 / 50

What is the purpose of the static keyword in C?

A. It makes a variable local to the function.

B. It specifies that a variable should not be modified.

C. It is used to define a constant value.

D. It makes a variable retain its value between function calls.

36 / 50

The increment operator (++) can be used both before and after a variable, with slightly different effects.

False

True

37 / 50

What is the scope of a variable declared inside a function?

a) Global

b) Local to the function

c) Accessible from other functions

d) Depends on the compiler

38 / 50

Which of the following is not a valid data type in C?

A. double

B. char

C. string

D. float

39 / 50

Which loop iterates a fixed number of times?

(a) while loop

(b) for loop

(d) All of them

40 / 50

Syntax errors will be detected by the compoler.

False

True

41 / 50

What is the difference between = and == operators?

(a) = assigns values, == compares values

(b) = is for strings, == is for numbers

(d) Both operators do the same thing

42 / 50

Which of the following is a valid comment in C?

a) // This is a comment

b) /* This is a multi-line comment */

c) # This is a preprocessor directive

d) Both a and b

43 / 50

How do you declare an array of 10 integers in C?

(a) int arr[10];

(b) int *arr = 10;

(d) int arr = new int[10];

44 / 50

The float data type provides more precision than the double data type.

True

False

45 / 50

In C, what is the purpose of the goto statement?

A. It is used to break out of a loop.

B. It is used to skip the next iteration of a loop.

C. It transfers control to a labeled statement.

D. It is used to define a label.

46 / 50

The modulus operator (%) gives the remainder of a division operation.

True

False

47 / 50

What does the sizeof operator return in C?

A. The size of the variable in bits.

B. The size of the variable in bytes.

C. The size of the variable in kilobytes.

D. The size of the variable in megabytes.

48 / 50

The if statement allows conditional execution of code.

False

True

49 / 50

A C variable name can start with a number.

True

False

50 / 50

What is the purpose of comments in C code?

(a) To execute instructions

(b) To explain code for better understanding

(d) None of the above

Your score is

The average score is 18%

Hone your C programming knowledge with Part 1 of our 50+ MCQs challenge! Test your understanding of variables, operators, control flow, and more.

Part-1 C MCQs | C mcq questions and answers | Top 50 MCQs in C

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