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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n;
  5. 	double x = 1,y = 0,z;
  6.  
  7. 	scanf("%d",&n);
  8.  
  9. 	for (int i = 0 ;i < n;i++){
  10. 		z = x/(i*2+1);
  11. 		y = y + z;
  12. 		x = -x;
  13. 	}
  14. 	printf("%.6f",y);
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0.01s 5272KB
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0.866667
https://ideone.com/o7RLB9
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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