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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int sum(int n)
  6. {
  7.     if (n == 1)
  8.         return 1;
  9.     else
  10.         return n + sum(n - 1);
  11. }
  12.  
  13. int main(void)
  14. {
  15.     int N;
  16.     cin >> N;
  17.  
  18.     cout << sum(N);
  19.     return 0;
  20. }
Success #stdin #stdout 0s 4272KB
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https://ideone.com/phhYuT
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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