不兼容類型：布爾不能轉換爲double（錯誤）

Question

import javax.swing.JOptionPane; 

import java.util.Scanner; 

public class pay{ 

static Scanner sc; 

public static void main (String[]args) 

{ 
    double Regpay = 8; 
    double OThour = Regpay * 1.5; 
    double hours = 0; 
    double gpay = Regpay * hours; 
    double Totalpay = OThour + gpay; 

    Scanner input = new Scanner(System.in); 
    System.out.println("Normal pay for hours worked less than 40hrs will be, £8.00 per hour"); 
    System.out.println("If workers work more than 40hrs, their pay will be time and a half"); 
    System.out.println("please enter your name"); 
    String name = sc.nextLine(); 

    System.out.println("How many hours did you work this month"); 
    hours = sc.nextDouble(); 

    System.out.println("How many hours overtime did you work"); 
    OThour = sc.nextDouble(); 




    if (hours<=40){ 
     Totalpay = gpay; 
     System.out.print("You are not entitled to overtime pay"); 
    }else{ 
     if (hours>=41) 
     Totalpay = gpay + OThour >=1; 
    } 
    }   
} 

我收到錯誤就行了Totalpay = gpay + OThour >=1;我不知道該怎麼辦，我一直試圖改變周圍的事情，但我不斷收到同樣的錯誤!!!!

Answer 1

您正在尋找的答案（我假設）是測試OTHoure是否大於1，並將其添加到TotalPay。要完成此操作，請使用

替換TotalPay = TotalPay + OTHours> = 1

if(OTHours>=1){ 
    TotalPay = gPay + OTHour; 
} 

Answer 2

您正在組合兩個不兼容的表達式類型。

Totalpay = gpay + OThour >=1; 

使用操作的順序， 「gpay + OThour> = 1」 是兩個表達式：

gpay + OThour : (the sum of two doubles) 

(result of gpay + OThour) >= 1 : (a boolean expression) 

這樣做的結果是一個布爾答案（真/假），這是不被解析爲雙倍，所以它不能存儲在TotalPay中。其次，你的結果不會像預期的那樣 - 你使用的變量（gpay）已經被初始化爲0，並且永遠不會被改變。

Answer 3

@purpleorb和@ Jaboyc已經解釋了錯誤被拋出的原因。我要談一個更全面的解決方案。

有幾個問題與此

1. 從用戶
2. 布爾被分配到雙重問題（如你所提到的）
3. 不必要的if語句讓輸入之前查找變量值結構

您可以將代碼更改爲以下來解決這些問題：

Scanner input = new Scanner(System.in); 
    System.out.println("Normal pay for hours worked less than 40hrs will be, £8.00 per hour"); 
    System.out.println("If workers work more than 40hrs, their pay will be time and a half"); 
    System.out.println("please enter your name"); 
    String name = input.nextLine(); 

    double hours = 0; 
    System.out.println("How many hours did you work this month"); 
    hours = input.nextDouble(); 

    double Regpay = 8; 
    double OThour = Regpay * 1.5; 
    double gpay = Regpay * hours; 
    double Totalpay = OThour + gpay; 

    if (hours>40){ 
     Totalpay = gpay + (OThour- 1) * (hours - 40); 
    }else{ 
     Totalpay = gpay; 
     System.out.print("You are not entitled to overtime pay"); 
    } 

這樣做是在用戶將值輸入到hours之後進行計算gpay = Regpay * hours和Totalpay = OThour + gpay。此外，這可以通過檢查小時數是否大於40來簡化if語句結構，然後再執行所需的計算。