java - 程序没有在我的 if else 语句中分配值

Question

我对 Java 很陌生，我的任务是制作一个税务计算器。一切似乎都工作正常，但当我最后打印时，联邦税总是打印 0。我在开始时进行了 double ，然后尝试通过 else if 语句根据情况重新分配它。

//2353161 Tomas Pospisil
import java.util.Scanner;

public class PaymentCalculator {

    public static void main(String[] args){
        //Create Scanner for user input
        Scanner input = new Scanner(System.in);

        //Ask the user for Gross Pay
        System.out.print("Please Enter Gross Pay: ");
        double GrossPay = input.nextInt();

        //Establish the integer for Number of Exemptions
        int NoE = 0;

        //Establish the integer for the value of exemption
        double exemptionvalue = 0;

        double federaltaxes = 0;

        //Ask the user if they are married
        System.out.print("Are you married: ");
        String marriedstatus = input.next();

        //If yes make the number of Exemptions equal the user input
        if (marriedstatus.equals("yes")) {
        System.out.print("Please enter Number of Exemptions: ");
            NoE = input.nextInt();
        }
        //If not make the number of exemptions equal 1
        else if(marriedstatus.equals("no")) {
         NoE = 1;
        }
        //If NoE is greater than 4 make it 5 for later use
        if (NoE >4) {
            NoE = 5;
        }

        // Depending on the number of exemptions the program assigns it a value for later use
        switch (NoE) {
        case 1: 
            exemptionvalue = 1000;
            break;
        case 2:
            exemptionvalue = 1800;
            break;
        case 3:
            exemptionvalue = 2400;
            break;
        case 4:
            exemptionvalue = 3600;
            break;
        case (5):
            exemptionvalue = 4000;
            break;  
        }

        //Calculate adjusted wages
        double adjustedwages = GrossPay - exemptionvalue;

        // Figure out the tax percentage
        if (GrossPay >= 10000) {
            federaltaxes = GrossPay * 0;
        }
        else if (GrossPay <= 30000 && GrossPay >= 10000) {
            federaltaxes = GrossPay * 0.15 ;
        }
        else if (GrossPay > 30000) {
            federaltaxes = GrossPay * 0.20 ;
        }


        //Program calculates the FICA
        double FICA = (GrossPay * .065);

        //Program calculates Medicare
        double Medicare = (GrossPay * .014);

        //Program calculates the federal taxes


        //Program Calculates Net Pay
        double NetPay = GrossPay - (FICA + Medicare + federaltaxes);    


        //Program prints the results
        System.out.println("   Payroll Taxes");
        System.out.println("Gross.....$ " + GrossPay);
        System.out.println("Exemptions:   " + NoE);
        System.out.println("Federal Taxes.....$ " + federaltaxes);
        System.out.println("   FICA.....$ " + FICA);
        System.out.println("   Medicare.....$ " + Medicare);
        System.out.println("-----------------------------");
        System.out.println("Net Pay.....$ " + NetPay);







    }
}

Answer 1

这是给您带来麻烦的 block 。

if (GrossPay >= 10000) {
        federaltaxes = GrossPay * 0;
    }

任何高于 10000 的 GrossPay 金额都将通过条件并乘以 0。