While Loops

Lesson 22
Author : Afrixi
Last Updated : January, 2023

C - Programming Language

This course covers the basics of programming in C.

A while loop is a control flow statement that allows you to repeatedly execute a block of code as long as a specified condition is true. Here’s an example of a while loop in C:

#include <stdio.h>

int main() {
    int count = 0;

    while (count < 5) {
        printf("Count is %d\n", count);
        count++;
    }

    return 0;
}

In this example, we have a while loop that runs as long as the count variable is less than 5. Inside the loop, we print out the value of count using printf() and then increment count by 1 using the ++ operator.

Here’s how the loop works:

First, we initialize the count variable to 0.
Next, we start the while loop. Since count is currently 0, the condition (count < 5) is true, so we enter the loop.
Inside the loop, we print out “Count is 0” using printf().
We then increment count by 1 using the ++ operator, so count is now 1.
Since count is still less than 5, we go back to the top of the loop and repeat steps 3-4 with the new value of count.
We repeat this process until count is no longer less than 5. At this point, the condition (count < 5) is false, so we exit the loop and continue with the rest of the program.

While loops are useful for situations where you need to repeat a block of code an unknown number of times, depending on some condition. They can be a bit tricky to get right, since you need to make sure the condition eventually becomes false to avoid an infinite loop.

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