program4_03.c

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/* Program 4.3   Sum the integers from 1 to a user-specified number */
#include <stdio.h>

int main(void)
{
  long sum = 0L;                      /* Stores the sum of the integers      */
  int count = 0;                      /* The number of integers to be summed */

  /* Read the number of integers to be summed */
  printf("\nEnter the number of integers you want to sum: ");
  scanf(" %d", &count);

  /* Sum integers from 1 to count */
  for(int i = 1 ; i <= count ; i++)
    sum += i;

  printf("\nTotal of the first %d numbers is %ld\n", count, sum);
  return 0;
}