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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     double Xn = 1, Sn = 0, epsilon; unsigned int n = 0;
  8.     cin >> epsilon;
  9.     while (Xn >= epsilon)
  10.     {
  11.         n++;
  12.         Xn *= 2.0 / (n+1);
  13.         Sn += Xn;
  14.     }
  15.     cout << fixed << setprecision(15) << n << " " << Sn << endl;
  16.     return 0;
  17. }
Success #stdin #stdout 0s 3464KB
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0 0.000000000000000
https://ideone.com/VdDlP3
D2655b
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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