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  1. #include <stdio.h>
  2. #include <math.h>
  3. #define daikei(a,b,k) (((a)+(b))*(k)*0.5);
  4. double menseki(double c,double d,double n)
  5. {
  6. 	double r,l,S,h1,h2,k,p,z;      //c,d円の始点終点  n等分  r直径  l,x座標  S面積の合計
  7. 	//h1一個前の台形の高さ    ｈ2今の台形の高さ   k台形の高さ
  8. 	r=d-c;
  9. 	l=c;
  10. 	h1=h2=0;
  11. 	k=r/n;
  12. 	S=p=0;
  13. 	z=0;
  14.  
  15. 	for (int i =1;i<=n;i++){
  16. 		l=l+(r/n);
  17. 		z=l-c;
  18. 		h2=sqrt(r*r*0.25-z*z);
  19. 		S=S+daikei(h2,h1,k);
  20. 		h1=h2;
  21. 	}
  22. 	p=S*2;
  23. 	return(p);
  24. 	}
  25.  
  26. int main (void){
  27.  
  28. 	double c,d,n;
  29.  
  30. 	scanf("%lf",&c);
  31. 	scanf("%lf",&d);         //円の半径
  32. 	scanf("%lf",&n);	      //n等分
  33.  
  34.  
  35. 	printf("%lf",menseki(c,d,n));
  36.  
  37. 		return (0);
  38. }
  39.  
  40.  
  41.  
Success #stdin #stdout 0s 5316KB
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-nan
https://ideone.com/P40xIi
language:
C (gcc 8.3)
created:
5 hours ago
visibility:
public

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