我是菜鸟，所以请原谅我的菜鸟缩进，如果它们不符合标准。任何关于缩进的建议将不胜感激。所以我的问题是，在 switch 语句之后，计算机没有读取下一行代码。这是最后的最终发票金额等式并将其打印到屏幕上。还有一个错误说：
InvoiceApp.java:34: error: possible loss of precision
switch(discountPercent)
^
required: int
found: double
1 error
正如您将看到的，我将变量 discountPercent 分配为双精度值。所以我不确定为什么会出现错误。任何帮助将不胜感激。谢谢你。到目前为止，这是我的代码。
import java.util.Scanner;
public class InvoiceApp
{
public static void main(String[] args)
{
//Declare variables and Scanner object
Scanner input = new Scanner(System.in);
double subtotal, discountAmount, discountPercent, invoiceTotal;
int customerType;
//Display a welcome message
System.out.println("Welcome to the invoice calculator app!");
//Prompt user for customer type
System.out.print("Please enter the customer type(1 for Silver, 2 for Gold, or 3 for Platinum): ");
//Read customer type
customerType = input.nextInt();
//Prompt user for subtotal
System.out.print("Please enter the subtotal amount: ");
//Read subtotal
subtotal = input.nextDouble();
//Calculate Discount Rate
switch(discountPercent)
{ //start switch block
case 1:
{
if (subtotal >= 500)
{
discountPercent = .20;
System.out.print("Your discount rate is .20");
break;
}
else if (subtotal >= 250)
{
discountPercent = .15;
System.out.print("Your discount rate is 15% !");
break;
}
else if (subtotal >= 100)
{
discountPercent = .10;
System.out.print("Your discount rate is 10%!"); break;
}
else if(subtotal < 100)
{
discountPercent = .0;
System.out.print("Sorry, your discount rate is 0%!"); break;
}
}//end of case one block
case 2:
{
{
discountPercent = .2;
System.out.print("Your discount rate is 20%!");
break;
}
}//end of case two block
case 3:
{
if (subtotal >= 500)
{
discountPercent = .50;
System.out.print("Woop woop, your discount rate is 50%!");
break;
}
else if (subtotal < 500)
{
discountPercent = .40;
System.out.print("Your discount rate is 40%!"); break;
}
}//end of case three block
default:
{
{
discountPercent = .5;
System.out.print("Congratulations! Your discount rate is 50 %! "); }
}
}//end of switch discountPercent
//Calculate Invoice Total
discountAmount = subtotal * discountPercent;
invoiceTotal = subtotal - discountAmount;
System.out.println("Total: " + invoiceTotal);
//Display thank you message
System.out.println("Thank you!");
//Format and display the results
System.out.print("Jump around! Jump around! Your invoice total is: " + invoiceTotal);
}//end of main
}//end of class