我的 IF 语句中缺少 break 语句

Question

我目前正在做一项 class 任务，涉及计算任意数量的具有独立尺寸的墙所需的油漆量，问题是我已经设置了所有内容和所有计算以及所有内容正确锻炼。

我正在使用 IF 语句将 EU 转移到正确的代码块，但出于某种原因，当我使用英尺到英制加仑部分时，它仍然尝试运行米到升部分出色地。我在第一个 IF 语句和 DO WHILE 循环（用于计算墙壁总面积和房间面积的循环）末尾显然遗漏了一些东西，我只是想知道是否有人可以快速浏览一下它并且给我指明正确的方向。如果您能提供帮助，下面附上代码。

（对于第一次在这里发帖的任何差异，请多多包涵，哈哈）

public static void main(String[] args) throws IOException
{
        double widthOfWall = 0;
        double lengthOfWall = 0;
        double areaOfWall = 0; 
        double areaOfRoom = 0;
        double paintNeeded = 0;
        char   UnitsUsed = ' '; 
        char   extraCalc = 0;
        
        
        
    //Scanner class
    Scanner keyboard = new Scanner (System.in);
    
    {   
    System.out.println("Are using Feet or Metre? (F/M)");
    UnitsUsed = ValidateData.checkTwoChars('F', 'M');
    {
        {   
if (UnitsUsed == 'F')
    
    do{ 
        System.out.println("Please enter width of the wall");
        widthOfWall = keyboard.nextDouble();
        
        System.out.println("Please enter the Length of the wall");
        lengthOfWall = keyboard.nextDouble();
        
        areaOfWall = widthOfWall * lengthOfWall; 
        System.out.println("The area of this wall is " + areaOfWall);
        
        System.out.println("Do you require an additional calculation? ");
        extraCalc = ValidateData.checkTwoChars('Y', 'N'); 
        
        areaOfRoom += areaOfWall;
        areaOfWall ++; 
        
        
System.out.println("The area of the room " + areaOfRoom);
        
        
        paintNeeded = areaOfRoom / 6.229; 
        System.out.println("The amount of paint needed (in Imperial Gallons) " + paintNeeded);
        }
        while (extraCalc == 'Y'); 
        

else if (UnitsUsed == 'M');
    
    //Do while loop
    do{ 
    System.out.println("Please enter width of the wall");
    widthOfWall = keyboard.nextDouble();
    
    System.out.println("Please enter the Length of the wall");
    lengthOfWall = keyboard.nextDouble();
    
    areaOfWall = widthOfWall * lengthOfWall; 
    System.out.println("The area of this wall is " + areaOfWall);
    
    System.out.println("Do you require an additional calculation? ");
    extraCalc = ValidateData.checkTwoChars('Y', 'N'); 
    
    areaOfRoom += areaOfWall;
    areaOfWall ++; 
    }
    while (extraCalc == 'Y'); 
    
    System.out.println("The area of the room " + areaOfRoom);
    
    paintNeeded = areaOfRoom / 12; 
    System.out.println("The amount of paint needed (in litres) " + paintNeeded);
    }




}
}}

}

Answer 1

这里用分号代替左大括号 {:

else if (UnitsUsed == 'M');

此外，这是很多重复的代码，而两个分支之间的唯一区别是单位。您可以使用三元运算符设置乘数和单位字符串变量，然后消除 if/else 以简化此操作。

我的 IF 语句中缺少 break 语句

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