while loop in C

while statement:         While statement is used for repetitive execution of statements more than once.

         

            Syntax:           while(condition)

                                    {

-          -     -          

-          -     -           code block (Statements)

                                    }

Here,

Ø  First the condition is evaluated.  It produces either TRUE or FALSE.

Ø  If the condition is TRUE, then Code Block (Statements) will be executed, again control reaches to condition section and is evaluated.

Ø  The process is repeated until the condition becomes FALSE.

Ø  When the condition reaches to FALSE, then the control is transferred out of the loop.

Flowchart:

           

/* PROGRAM TO PRINT FIRST N NATURAL NUMBERS */

#include<stdio.h>

#include<conio.h>

main()

{

            int i=1,n;

            clrscr();

            printf("\n Enter how many numbers:");

            scanf("%d",&n);

            printf("\n Natural Numbers Are:");

            while(i<=n)

            {

                        printf(" %3d",i);

                        i++;

            }

}