fork(1) download
copy 
  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. int main(){
  5.     int n;
  6.     double answer;
  7.     answer = 1;
  8.     std::cin >> n;
  9.  
  10.     for(int i = 0; i < n+1; i++){
  11.         answer-=pow(-1, n+1)/n;
  12.     }
  13.  
  14.     std::cout << answer << "\n";
  15. }
Success #stdin #stdout 0.01s 5328KB
comments (?)
stdin
copy 
2
stdout
copy 
2.5
https://ideone.com/Tqyjh5
language:
C++ (gcc 8.3)
created:
4 hours 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!