如果在数组中输入的数据小于零，我正在尝试创建错误消息，请输入验证

宠物桑度

该方法允许用户输入一年中每个月的降雨量。我试图防止小于零的数据存储在数组中。我正在使用do-while循环，但似乎无法弄清楚如何检查输入是否小于零。感谢您的帮助，干杯！

public static double[] getRainFall()
    {
        double[] rainfallMonths = new double[12];
        double[] rainfall = new double[12];

        do
        {
            for(int x = 0; x < rainfallMonths.length; x++)
            {
                    System.out.print("What is the rainfall for month #" + (x + 1) + ": ");
                rainfallMonths[x] = keyboard.nextDouble();
                rainfall[x] = rainfallMonths[x];

                if(rainfallMonths < 0)
                {
                    System.out.println("Input is Invalid");
                }
            }
        }while(rainfallMonths < 0);


        for(int count = 0; count < rainfallMonths.length; count++)
        {
            System.out.println("Rainfall Month #" + (count + 1) + ": " + rainfall[count]);
        }

        return rainfall;
    }

疯狂程序员

您的逻辑有些偏离，更不用说您正在尝试将数组与int...

首先，逻辑...

do 
    for x = 0 to rainfallMonths.length -1 do
        ... get input...
while value < 0

这里的问题是，您已经将输入分配给了for-next循环中数组的所有元素，但是随后您尝试验证输入的值，而该值for-next可能永远不会返回有效的结果...而且为时已晚...

相反，您想颠倒逻辑...

for x = 0 to rainfallMonths.length -1 do
    do 
        value = get input from user
    while value < 0
    rainfallMonths[x] = value

接下来，rainfallMonths是对数组的引用，这实际上不是您要检查的对象，您需要检查其中的一个值或元素，例如...

while (rainfallMonths[x] < 0);

如果那都没有道理...

public static double[] getRainFall()
{
    double[] rainfallMonths = new double[12];
    double[] rainfall = new double[12];

    for(int x = 0; x < rainfallMonths.length; x++)
    {
        double input = 0;
        System.out.print("What is the rainfall for month #" + (x + 1) + ": ");
        do {
            rainfallMonths[x] = keyboard.nextDouble();
            rainfall[x] = rainfallMonths[x];
            if(input < 0)
            {
                System.out.println("Input is Invalid");
            }
        } while (rainfallMonths[x] < 0);    
    }


    for(int count = 0; count < rainfallMonths.length; count++)
    {
        System.out.println("Rainfall Month #" + (count + 1) + ": " + rainfall[count]);
    }

    return rainfall;
}

你可能想采取一个进修阵列，这应有助于;）

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