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  1. #include <stdio.h>
  2.  
  3. /*
  4.  * 等比数列の和
  5.  * 初項a0=7, 公比d=0.5
  6.  */
  7. int main(void) {
  8. 	double a=1, sum=0;	//(初)項、和
  9. 	double pre, diff;	//前項、差分
  10. 	int i=0;			//i番目
  11.  
  12. 	do{
  13. 		sum = sum + a;
  14. 		pre = a;		//前項
  15. 		a = -0.5*a;		//次項
  16. 		i = i + 1;
  17. 		//printf("%d %f\n",i,a);	//確認用
  18. 		if(pre>a){
  19. 			diff = pre - a;
  20. 		}else{
  21. 			diff = a - pre;
  22. 		}
  23.  
  24. 	}while(diff>0.0000001);
  25. 	printf("合計 %.7f\n",sum);
  26.  
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout 0s 5308KB
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Standard input is empty
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合計 0.6666667
https://ideone.com/0Bu7Kt
dowhile 無限等比数例の収束
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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