运费计算器错过计算

Question

作业的费率如下： 每 500 英里装运的包裹重量 2 磅或更少 $1.10 超过 2 磅但不超过 6 磅 $2.20 超过 6 磅但不超过 10 磅 $3.70 超过 10 英镑 $3.80

每 500 英里的运费不按比例计算。例如，如果一个 2 磅的包裹运送 502 英里，则费用为 2.20 美元。编写一个程序，要求用户输入包裹的重量，然后显示运费。

我的问题是我得到了错误的答案。这是我到目前为止得到的：

import java.util.Scanner;
public class ShippingCharges
{
public static void main (String [] args)
{
    double mDrive, rMiles, wPound;

    Scanner keyboard = new Scanner (System.in);

    System.out.print ("Enter Weight of Package: ");
    wPound = keyboard.nextDouble();
    System.out.println("");

    System.out.print ("Enter Miles Driven: ");
    mDrive = keyboard.nextDouble();
    System.out.println("");

    rMiles = mDrive / 500;

    if (wPound <2)
    {
        System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*1.10);
    }

    if (wPound >=2 && wPound <6)
    {
        System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*2.20);
    }

    if (wPound >=6 && wPound <10)
    {
        System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*3.70);
    }

    if (wPound >= 10)
    {
        System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*3.80);
    }

}
}

按照示例，程序应该执行 502/500 *2.2 即 2.2 并且程序显示 4.4。有什么建议吗？

Answer 1

你的 if 语句是罪魁祸首。按照您提供的说明，声明应如下所示

if (wPound<=2) {
    System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*1.10);
}
else if(wPound<=6) {
    System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*2.20);
}
else if (wPound<=10) {
    System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*3.70);
}
else {
    System.out.println ("You will be charged "+ "$" + Math.ceil(rMiles)*3.80);
}