/*
 sum smallNum to bigNum
       */

#include <stdio.h>

int sum(int small, int big)
{
 if(small==big)
  return big;
 else
  return sum(small+1, big) + small;
}

int main()
{
 printf("input small Num\n");
 int smallNum;
 scanf("%d", &smallNum);
 printf("input big Num\n");
 int bigNum;
 scanf("%d", &bigNum);

 int result;
 result = sum(smallNum, bigNum);
 
 printf("sum smallNum to bigNum = %d\n", result);

 return 0;
}

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