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  1. #include <stdio.h>
  2.  
  3. int main(void) 
  4. {
  5.     double e;
  6.     scanf ("%lf", &e);
  7.     double s = 0;
  8.     double a=0.5;
  9.     int i=1;
  10.     while(a>e)
  11.        { 
  12.        	i++;
  13.        	s+=a;
  14.         a=1.0/(i*(i+1.0));
  15.        }
  16.     printf("%0.4lf\n", s);
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 2252KB
comments (?)
stdin
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0.035
stdout
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0.8000
https://ideone.com/pIrWtR
looks like ok
language:
C99 (gcc 8.3)
created:
9 years ago
visibility:
public

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