不兼容类型：布尔不能转换为double（错误）

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; 
    } 
    }   
} 

我收到错误就行了Totalpay = gpay + OThour >=1;我不知道该怎么办，我一直试图改变周围的事情，但我不断收到同样的错误!!!!

Answer 1

您正在寻找的答案（我假设）是测试OTHoure是否大于1，并将其添加到TotalPay。要完成此操作，请使用

替换TotalPay = TotalPay + OTHours> = 1

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

Answer 2

您正在组合两个不兼容的表达式类型。

Totalpay = gpay + OThour >=1; 

使用操作的顺序， “gpay + OThour> = 1” 是两个表达式：

gpay + OThour : (the sum of two doubles) 

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

这样做的结果是一个布尔答案（真/假），这是不被解析为双倍，所以它不能存储在TotalPay中。其次，你的结果不会像预期的那样 - 你使用的变量（gpay）已经被初始化为0，并且永远不会被改变。

Answer 3

@purpleorb和@ Jaboyc已经解释了错误被抛出的原因。我要谈一个更全面的解决方案。

有几个问题与此

1. 从用户
2. 布尔被分配到双重问题（如你所提到的）
3. 不必要的if语句让输入之前查找变量值结构

您可以将代码更改为以下来解决这些问题：

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"); 
    } 

这样做是在用户将值输入到hours之后进行计算gpay = Regpay * hours和Totalpay = OThour + gpay。此外，这可以通过检查小时数是否大于40来简化if语句结构，然后再执行所需的计算。