【杭电ACM】1.2.1 Biker's Trip Odometer

杭电ACM1.2.1 Biker's Trip Odometer

http://acm.hdu.edu.cn/game/entry/problem/show.php?chapterid=1&sectionid=2&problemid=2
 1 //author:pz
 2 
 3 import java.text.DecimalFormat;
 4 import java.util.Scanner;
 5 
 6 public class Main{
 7     final double PI =  3.1415927;
 8     final int InchesPerFoot = 12;
 9     final int FeetPerMile = 5280;
10     final int SecondsPerMinute = 60;
11     final int MinutesPerHour = 60;
12 
13     double diameter;
14     int revolutions;
15     double time;
16     double distance;
17     double mph;
18     
19     static int count = 1;
20 
21     Main(double diameter, int revolutions, double time){
22         this.diameter = diameter;
23         this.revolutions = revolutions;
24         this.time = time;        
25     }
26     
27     void calculate(){
28         DecimalFormat df = new DecimalFormat("0.00");//这里如果写 #.00 将会通不过。。。郁闷了很长时间
29         double perimeter = PI * diameter;
30         double inchesDistance = perimeter * revolutions;
31         double feetDistance = inchesDistance / InchesPerFoot;
32         distance = feetDistance / FeetPerMile;
33         double minuteTime = time / SecondsPerMinute;
34         double hourTime = minuteTime / MinutesPerHour;
35         mph = distance / hourTime;
36         System.out.println("Trip #" + count + ": " + df.format(distance) + " " + df.format(mph));
37         count ++;
38     }
39     
40     public static void main(String args[]){
41         Scanner scan = new Scanner(System.in);
42         while(scan.hasNext()){
43             double diameter = scan.nextDouble();
44             int revolutions = scan.nextInt();
45             if(revolutions == 0)
46                 break;
47             double time = scan.nextDouble();
48             Main trip = new Main(diameter, revolutions, time);
49             trip.calculate();            
50         }
51     }
52 }