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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	 int N, k=1;
  6.     double S=1.;
  7.  
  8.     cout << "N="; cin >> N;
  9.  
  10.     for (int i = 1; i < N; i++)
  11.     {
  12.         k*=-2;
  13.         S+=1./k;        
  14.     }
  15.  
  16.     cout << "S=" << S << "\n";
  17. 	return 0;
  18. 	system("pause");
  19. }
Success #stdin #stdout 0.01s 5532KB
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stdin
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Standard input is empty
stdout
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N=S=inf
https://ideone.com/ZZjxkY
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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