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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	double  a,x=1,sum=0,e;//前項、項、合計、差分
  5. 	int i=1;//i番目
  6. 	do{
  7. 		sum=sum+x;
  8. 		a=x;
  9. 		x=-x/2;
  10. 		i=i+1;
  11. 		if(a>x){
  12. 			e=a-x;
  13. 		}else{
  14. 			e=x-a;
  15. 		}
  16. 	}while(e>1/1000000);
  17. 	printf("%.7f",sum);
  18.  
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/1bZRhu
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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