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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n = 1000;
  6.     double s = 0;
  7.     for(int i = 1; i < n; i++)
  8.        { double x = (i % 2 ? 1.0 : -1.0) * (2*i-1);
  9.        for(int j = 1; j <= i; j++)
  10.            x /= 3;
  11.        s += x;
  12. } cout << s;
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 15232KB
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Standard input is empty
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0.125
https://ideone.com/f4Ae9a
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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