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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main() {
  6.     int n;
  7. 	double sum = 0;
  8. 	cin >> n;
  9. 	for (int i = 1; i <= n; i++) {
  10. 		sum += 1. / (i * (i + 1));
  11. 	}
  12. 	cout << fixed << setprecision(6) <<  sum;
  13. }
Success #stdin #stdout 0s 4516KB
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0.923077
https://ideone.com/dsPWdK
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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