program4_10.c

[C语言入门经典(第4版)]整本书的源码！值得推荐！全部是最简单的源码！

/* Example 4.10 Sums of integers with a while loop nested in a for loop */
#include <stdio.h>

int main(void)
{
  long sum = 1L;                       /* Stores the sum of integers      */
  int j = 1;                           /* Inner loop control variable     */
  int count = 0;                       /* Number of sums to be calculated */

  /* Prompt for, and read the input count */
  printf("\nEnter the number of integers you want to sum: ");
  scanf(" %d", &count);

  for(int i = 1 ; i <= count ; i++)
  {
    sum = 1L;                          /* Initialize sum for the inner loop */
    j=1;                               /* Initialize integer to be added    */
    printf("\n1");

    /* Calculate sum of integers from 1 to i */
    while(j < i)
    {
      sum += ++j;
      printf("+%d", j);                /* Output +j - on the same line */
    }
    printf(" = %ld\n", sum);           /* Output  = sum  */
  }
  return 0;
}