Sicily 1051. Biker's Trip Odomete

/*简单的求周长乘以转数得到总长，除以时间得到均速重点在于精度控制，小数点后两位 *//*Run Time: 0secsRun Memory: 312KB*/#include <iostream>#include <iomanip>using namespace std;double pi = 3.1415927;double mile = 5280 * 12;        //5280 feet = 1 mile； 12 inches = 1 footdouble hour = 60 * 60;int main(){    int N = 1;        double diam;   // inches    int revo;      // role    double time;   // second        double total;    //总长度     double evarage;  //平均速度         cin >> diam >> revo >> time;    while (revo != 0){        double total = (pi * diam * revo) / mile;              double evarage = (total / time) * hour;                cout << "Trip #" << N << ": "              << fixed << setprecision(2) << total << " "    //加了fixed意味着是固定点方式显示             << setprecision(2) << evarage << endl;         //所以这里的精度指的是小数位2位         cin >> diam >> revo >> time;        N++;     }     return 0;}