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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int main(){
  5. 	double sum, eps, next, A;
  6. 	int i=1;
  7. 	eps=0.001;
  8. 	A=-1/3.0;
  9. 	sum=A;
  10. 	while (abs(A)>eps){
  11. 		i=i+1;
  12. 		sum=sum+A;
  13. 		next=A*(-2)/(2*i+3);
  14. 		A=next;
  15. 	}
  16.  	cout << "sum="<< sum << endl << "i=" << i << endl;
  17.  	return 0;
  18. }
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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sum=-0.589266
A-6.47621e-10
https://ideone.com/peOBZJ
language:
C++14 (clang 8.0)
created:
9 years ago
visibility:
public

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