for and while

break and continue

—These interrupt normal flow of control

—

—break causes an exit from the innermost enclosing loop

—

—continue causes the current iteration of a loop to stop and the next iteration to begin immediately

do-while

§When a loop is constructed using

 while, the test for continuation is

 carried out at the beginning of each

 pass

—

§With do-while the test for continuation

 takes place at the end of each pass

  
do

  {

    statement

  } while (expression);

Example

int i = 1, sum = 0;

  do

  {

  sum = sum + i;

            i= i + 1;

  }while(i<=10);

  printf(“Sum = %d\n”, sum);

while  vs. do-while

§while -- the expression is tested first, if 

the result is false, the loop body is never 

executed

§do-while -- the loop body is always

 executed once. After that, the expression is tested, 

      if the result is false, the loop  body is not executed 

     again.