Repetition

Repetition

·One or more instruction repeated for certain amount 

of time

·Repetition/looping operation:

– For

– While

– Do-while

             1. For

•Syntax:

for(exp1; exp2; exp3) statement;

or:

for(exp1; exp2; exp3){

  statement1;

  statement2;

  …….

 }

exp1 :  initialization

exp2 :  conditional

exp3 :  increment or decrement

exp1, exp2 and exp3 are optional

EXAMPLE :

Program to print out numbers from 1 to 10

     #include<stdio.h>

int main()

{

    int x;

    for( x = 1 ;  x <= 10 ;  x++ ) printf( "%d\n", x );

    return(0);

}

      2. While

•Syntax :

while (exp) statements;

or:

while(exp){

  statement1;

  statement2;

   …..

}

EXAMPLE :

int counter = 1;

while ( counter <= 10 ) {

     printf( "%d\n", counter );

     ++counter;

}

3. Do-While

•Syntax :

do{

    < statements >;

} while(exp);

•Keep executing while exp is true

•exp evaluation done after executing the statement(s)

EXAMPLE :

int counter=0;

do {

     printf( "%d  ", counter );

  ++counter;

} while (counter <= 10);