/*-------------------------------------------------------------------*/
/* sumsub.c                                                          */
/*-------------------------------------------------------------------*/

#include <stdio.h>

int sumBetween(int iStart, int iEnd)

/* Return the sum of all integers between iStart and iEnd. */

{
   int i;
   int iSum = 0;
   for (i = iStart; i <= iEnd; ++i)
      iSum += i;
   return iSum;
}

/*-------------------------------------------------------------------*/

int main(int argc, char *argv[])

/* Read two integers from stdin, and write to stdout the sum of all 
   integers between the two. */

{
   int iFirst;
   int iSecond;
   int iSumBetween;

   printf("Enter an integer:  ");
   scanf("%d", &iFirst);
   printf("Enter another integer that is greater than the first:  ");
   scanf("%d", &iSecond);
   iSumBetween = sumBetween(iFirst, iSecond);
   printf("The sum of all integers between the two is %d.\n", iSumBetween);
   return 0;
}