Modifying the for Loop Control Variable

Introduction

You are not limited to incrementing the loop control variable by 1.

You can change it by any amount, positive or negative.

You could sum the first n integers backward.

Demo Code

#include <stdio.h>
int main(void)
{
  unsigned  long long sum = 0LL;            // Stores the sum of the integers
  unsigned int count = 0;                   // The number of integers to be summed

  printf("\nEnter the number of integers you want to sum: ");
  scanf(" %u", &count);

  // Sum integers from count to 1
  for(unsigned int i = count ; i >= 1 ; sum += i--);

  printf("\nTotal of the first %u numbers is %llu\n", count, sum);
  return 0;/*  w  ww  .  j a  v  a2 s . c  o  m*/
}

Modifying the for Loop Control Variable - C Statement

Introduction

Demo Code

Result

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