C Language MCQs

What does the following code output? #include void main() { int x = 5, y = 10; printf("%d", x + y); }

• 5

• 10

• 15

• Compilation error

Which header file is required to use the printf() function in C?

• stdio.h

• stdlib.h

• math.h

• string.h

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

• int *ptr;

• int ptr*;

• int& ptr;

• ptr int*;

What is the output of the following code? #include void main() { int arr[] = {1, 2, 3, 4}; printf("%d", arr[2]); }

• 1

• 2

• 3

• Compilation error

Which of the following statements about for loops is true?

• The loop executes at least once even if the condition is false.

• The loop continues until the condition becomes false.

• The loop must have a break statement.

• The loop cannot be nested.

What is the size of an int in C (on most platforms)?

• 1 byte

• 2 bytes

• 4 bytes

• Depends on the compiler and platform

Which of the following is a valid variable name in C?

• 123abc

• _value

• float

• @data

What is the purpose of the return statement in C?

• To output a value to the console

• To pass control to another function

• To terminate a function and optionally return a value

• To define the entry point of the program

What will be the output of the following code? #include void main() { int x = 10; if (x > 5) printf("Greater"); else printf("Smaller"); }

• Greater

• Smaller

• GreaterSmaller

• Compilation error

Which of the following functions is used to dynamically allocate memory in C?

• alloc()

• malloc()

• new()

• free()