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  1. #include <stdio.h>
  2.  
  3. int sum(int m, int n) {
  4.     if (m > n) 
  5.         return 0;
  6.     else
  7.     	return m + sum(m + 1, n);
  8.  
  9. }
  10.  
  11. int main() {
  12.     int a, b;
  13.     scanf("%d %d", &a, &b);
  14.  
  15.     if (a > 0 && b > 0 && a <= b) {
  16.         int S = sum(a, b);
  17.         printf("%d \n",S);
  18.     }
  19.  
  20.    return 0;
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/nHIG6H
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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