poj1665

简单题

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

#define pi 3.1415927

int revolution;
double travel_time, diameter;

int main()
{
    int t = 0;
    while (scanf("%lf%d%lf", &diameter, &revolution, &travel_time), revolution)
    {
        t++;
        double distance = revolution * pi * diameter / 12 / 5280;    
        double mph = distance * 3600 / travel_time;
        printf("Trip #%d: %.2f %.2f\n", t, distance, mph);
    }
    return 0;
}