do-while loop control statements in C-language

do-while statement:               do-while is also a loop control statement used for repetitive execution of statements.  The general format of a do-while statement is:

                        

                          Syntax:           do

                                                {

-          -  -

-          -  -      Code Block (Statements)

-          -  -

                                                }

                                                while(condition);

Ø  First the compiler executes Block statements and then enters into condition section.

Ø  Condition is evaluated and produces either TRUE or FALSE.

Ø  If the condition outcome is TRUE, then again control enters into Block Statement and is executed.  This procedure is repeated until the condition becomes FALSE.

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

/* PROGRAM TO PRINT FIRST N NATURAL NUMBER USING DO-WHILE STATEMENT */

 main()

{

            int i=1,n;

            clrscr();

            printf("\nEnter how many numbers:");

            scanf("%d",&n);

            printf("\nNATURAL NUMBERS ARE:");

            do

            {

                        printf("%5d",i);

                        i=i+1;

            }

            while(i<=n);

}