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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6.     int org = 0;
  7.     cin >> n;
  8.     double i = 1;
  9.     double sum = 0;
  10.     do {
  11.         sum += 1.0 / ((i) * (i + 1));
  12.         i++;
  13.     } while (i <= n);
  14.     cout << fixed;
  15.     cout << sum << " ";
  16.     cout << 1.0 / ((n * (n + 1)*(n+1)));
  17.     cout << (1.0 - sum) * 1e9 << endl;
  18. }
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
5
1
2
3
4
5
stdout 
0.833333 0.005556166666666.666667
https://ideone.com/CR9D3r
language:
C++14 (gcc 8.3)
created:
15 days ago
visibility:
public

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