HDU 1038 - Biker's Trip Odometer

算一下路程和速度...

 #include <iostream>
 #include <cstdio>
 using namespace std;
 const double p=3.1415927;
 double dia,tim,dis,sped;
 int rev;
 int main()
 {
     int k=;
     while(cin>>dia>>rev>>tim,rev)
     {
         dia/=*;
         dis=dia*p*rev;
         sped=dis/tim**;
         printf("Trip #%d: %.2lf %.2lf\n",k++,dis,sped);
     }
 }