WHILE LOOP

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 The syntax of the while loop is:

    while (test expression)
    {

    // statements inside the body of the loop

    }

    How while loop works??
    • The while loop evaluates the test expression inside the parenthesis ().
    • If the test expression is true, statements inside the body of while loop are executed. Then, the test expression is evaluated again.
    • The process goes on until the test expression is evaluated to false.
    • If the test expression is false, the loop terminates (ends).


    Example :
    #include <stdio.h>
    void main()
    {
        int i = 1;

        while (i <= 5)
        {
            printf(" %d ", i);
            ++i;
        }
    }

    Output : 1 2 3 4 5

    Now Let's iterate above example

      Here, we have initialized i to 1.
    • When i is 1, the test expression i <= 5 is true. Hence, the body of the while loop is executed. This prints 1 on the screen and the value of i is increased to 2.
    • Now, i is 2, the test expression i <= 5 is again true. The body of the while loop is executed again. This prints 2 on the screen and the value of i is increased to 3.
    • This process goes on until i becomes 6. When i is 6, the test expression i <= 5 will be false and the loop terminates.
                                         

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