C While loop

A while loop in C is a control flow statement used to execute a block of code repeatedly as long as a specified condition remains true. The condition is checked before each iteration, and if the condition is false initially, the loop is skipped entirely.

Syntax:


while (condition) {
    // Code to execute as long as the condition is true
}

Explanation:

condition: A boolean expression that is checked before each iteration. If it is true, the loop continues; if false, the loop terminates.

Example: Print the value from 1 to 5


#include <stdio.h>

int main() {
     int number = 1; // Initialize the number variable
        // While loop that runs until number is less than or equal to 5
        while (number <= 5)
        {
             printf("%d\n",number); // Prints the current value of number
             number++; // Increment count after each iteration
        }

    return 0;
}

Output:

1
2
3
4
5

C While loop – Interview Questions

Q 1: What is a while loop in C?
Ans: A loop that executes as long as the condition is true.
Q 2: Is while an entry-controlled loop?
Ans: Yes, the condition is checked before execution.
Q 3: When should we use a while loop?
Ans: When the number of iterations is not known beforehand.
Q 4: Can a while loop run infinitely?
Ans: Yes, if the condition never becomes false.
Q 5: Can a while loop have multiple statements?
Ans: Yes, by enclosing them in {}.

C While loop – Objective Questions (MCQs)

Q1. What is the correct syntax of a while loop in C?





Q2. The condition of a while loop is checked:





Q3. What happens if the condition in a while loop is false initially?





Q4. What is the output of this code?

int i = 1;
while (i <= 3) {
printf("%d ", i);
i++;
}





Q5. What can make a while loop run infinitely?





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