fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. // 10 + sum(9)
  5. // 9 + sum(8)
  6. // 8 + sum(7)
  7. // ......
  8. // 2 + 1
  9. // 1 + 0
  10. // 0 -> 0
  11.  
  12. int sum(int x) {
  13.   // x = 10;
  14.   if (x == 0) { // base case
  15.     return 0;
  16.   }
  17.  
  18.   return sum(x - 1) + x; // transition
  19. }
  20.  
  21. int main() {
  22.   int num = sum(10);
  23.   cout << num << endl;
  24.   return 0;
  25. }
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
55
https://ideone.com/j5VTVQ
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!