> #include <stdio.h>
> #include <math.h>
> 
> int main()
> {
>     float l,n,c,t,u,d,r,l1,angle,tmp;
>     while(scanf("%f%f%f",&l,&n,&c)&& (l!=-1))
>     {
>         l1 = l*(1+n*c);
>         tmp = l/l1;
>         u = 3.14*3/4;
>         d = 0;
>         while(fabs(u-d)>0.000000000001)
>         {
>             angle = (u+d)/2;t = sin(angle)/angle;
>             if(fabs(t-tmp)<0.00000000001)
>                break;
>             if(t>tmp)
>                 d = angle;
>             else
>                 u = angle;
>         }
>         r = l1/2/angle;
>         tmp = r*(1-cos(angle));
>         printf("%.3f\n",tmp);    
>     }    
>     return 0;
> }    

• Re:用二分过了，不过精度用得太高了，1e-12,pi用3.1415926535897932324626。。。 (64) wangling219 2008-09-15 12:09:17
  • Re:用二分过了，不过精度用得太高了，1e-12,pi用3.1415926535897932324626。。。 (94) KosonLau 2008-12-04 01:14:50