变量 c   声明为 浮点型!!!




#include<stdio.h>
#include<stdlib.h>
#define pi 3.1415927
float a,c,res,ans;int b,sign=1;
int main()
{ 
	while(scanf("%f%d%f",&a,&b,&c))
	{
	 if(b==0) break;
         res=pi*a*b/5280/12;
         ans=res/c*3600;
         printf("Trip #%d: %.2f %.2f\n",sign,res,ans);
         sign++;
        }
  system("pause");
  return 0;
}