*2.23（驾驶费用）编写一个程序，提示用户输入驾驶的距离、每加仑多少英里的汽车燃油性能值，以及每加仑的价格，然后显示旅程的费用。 下面是一个运行示例： Enter the driving distance:900.5 Enter miles per gallon:25.5 Enter price per gallon:3.55
*2.23(Cost of driving) Write a program that prompts the user to enter the distance to drive, the fuel efficiency of the car in miles per gallon, and the price per gallon then displays the cost of the trip. Here is a sample run: Enter the driving distance:900.5 Enter miles per gallon:25.5 Enter price per gallon:3.55
参考代码：
package chapter02; import java.util.Scanner; public class Code_23 { public static void main(String[] args) { double DriveDistance,MilePerGallon,PricePerGallon,CostDrive; Scanner Input; System.out.print("Enter the driving distance:"); Input = new Scanner(System.in); DriveDistance = Input.nextDouble(); System.out.print("Enter miles per gallon:"); Input = new Scanner(System.in); MilePerGallon = Input.nextDouble(); System.out.print("Enter price per gallon:"); Input = new Scanner(System.in); PricePerGallon = Input.nextDouble(); CostDrive = DriveDistance / MilePerGallon * PricePerGallon; System.out.println("The cost of driving is $" + CostDrive); Input.close(); } } 结果显示： Enter the driving distance:900.5 Enter miles per gallon:25.5 Enter price per gallon:3.5 The cost of driving is $123.59803921568627 Process finished with exit code 0