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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int main() 
  5. {
  6.  double sum, eps, prev,next,dif;
  7.  int i;
  8.  eps=1e-10;
  9.  prev=1; next=-1/3.0;
  10.  i=2; sum=1;
  11.  dif=abs(next-prev);
  12.  while (dif>eps)
  13.  {
  14.      sum=sum+next;
  15.      prev=next;
  16.      next=prev*(-1)/((2*i+1)*i);
  17.      i=i+1;
  18.      dif=abs(prev-next);
  19.  }
  20.  cout << "sum="<< sum << "\n" << endl;
  21.  return 0;
  22. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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sum=0.698456
https://ideone.com/T2cYXu
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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