Question 1

Which function is used to display output in C?

Accepted Answer

printf(). printf() is the standard output function in C, declared in <stdio.h>. Python uses print(), C++ uses cout, but in C it's printf().

Question 2

Which header file must be included to use printf() and scanf()?

Accepted Answer

. (Standard Input/Output) provides printf() and scanf(). has malloc/free; has string functions.

Question 3

What is the correct way to declare an integer variable in C?

Accepted Answer

int x;. In C, integer variables are declared with the 'int' keyword. 'integer', 'var', and 'number' are not valid C types.

Question 4

Which loop in C guarantees the body executes at least once?

Accepted Answer

do-while. The do-while loop checks its condition AFTER executing the body, ensuring it runs at least once regardless of the condition.

Question 5

What does the % operator do in C?

Accepted Answer

Modulus — returns the remainder after division. % is the modulus operator. For example, 10 % 3 = 1 (because 10 = 3×3 + 1). It's commonly used to check even/odd numbers.

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