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  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; i++){
  11.         answer-=(pow(-1, i)/n);
  12.     }
  13.  
  14.     std::cout << answer << "\n";
  15. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/pdgJ3L
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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