The while loop:

The simplest among all the looping structures in C is the while statement. The basic format of while statement is:

                                    initialization;

                                    while ( test condition )

                                    {

                                                body of loop

                                                increment/decrement;

                                    }

First test – condition is evaluated and if the condition is true, then the body of the loop is executed. After execution of the body, the test – condition is once again evaluated and if it is true, the body is executed once again. This process of repeated execution of the body continues until the test – condition finally becomes false and the control is transferred out of the loop. On exit, the program continues with the statement immediately after the body of the loop.

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