Loop Examples

• Counter-Controlled Repetition

  int i = 1, sum = 0;

  double average = 0.0;

  while ( i < 11 ){

  sum += i;             /* sum = sum + i ; */
  i ++;                     /* i = i + 1 */

  }

  average = sum / 10.0;

  printf("The average of 1, 2...10 is %f ", average);

• Sentinel-Controlled Repetition

  int counter = 0, sum = 0, number;

  double average = 0.0 ;

  /* read the first number */

  printf("please enter the non-negative integer, first negative value will terminate the loop ");

  scanf ("%d", &number);

  while ( number >= 0 ){

  sum += number ; /* sum = sum + number */
  counter ++; /* counter = counter + 1 */
  printf("please enter the non-negative integer, first negative value will terminate the loop ");
  scanf ("%d", &number);

  }

  if ( counter > 0 ){

  average = (double) sum / counter;

  }

  printf("The average of %d input value is %f ", counter, average);