计算器问题：只得到我输入的第二个值

Question

我创建了一个基本计算器，但每次输入第二个值并按等于按钮时，我都得不到任何结果。只有我输入的值 2nd。我的 +-*/ 方法在单独的 class 中。解决此问题的最佳方法是什么？这可能是一个简单的错误，但我找不到它。你也可以给我解释一下我做错了什么。提前致谢。

public sealed partial class Calculator : Page
{
    public double num01, num02;
    int operater;

    public Calculator()
    {
        this.InitializeComponent();
    }

    private void btn1_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text =txtcalcdisplay.Text+ "1";          
    }

    private void btn2_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "2";            
    }

    private void btn3_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "3";
    }

    private void btn4_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "4";        
    }

    private void btn5_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "5";
    }

    private void btn6_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "6";
    }

    private void btn7_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "7";
    }

    private void btn8_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "8";
    }

    private void btn9_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = txtcalcdisplay.Text + "9";
    }

    private void Clear_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text = string.Empty;
    }

    private void btnsubtract_Click(object sender, RoutedEventArgs e)
    {
        num01 = Convert.ToDouble(txtcalcdisplay.Text);
        txtcalcdisplay.Text = "";
        operater = '1';
    }

    private void btnadd_Click(object sender, RoutedEventArgs e)
    {
        num01 = Convert.ToDouble(txtcalcdisplay.Text);
        txtcalcdisplay.Text = "";
        operater = '2';
    }

    private void btnmultiply_Click(object sender, RoutedEventArgs e)
    {
        num01 = Convert.ToDouble(txtcalcdisplay.Text);
        txtcalcdisplay.Text = "";
        operater = '3';
    }

    private void btndivide_Click(object sender, RoutedEventArgs e)
    {
        num01 = Convert.ToDouble(txtcalcdisplay.Text);
        txtcalcdisplay.Text = "";
        operater = '4';
    }

    private void btnequals_Click(object sender, RoutedEventArgs e)
    {
        switch (operater)
        {
            case 1:
                num02 = Convert.ToDouble(txtcalcdisplay.Text);
                CalculationClass sub = new CalculationClass();
                double answer= sub.Subtract(num01, num02);
                txtcalcdisplay.Text = answer.ToString();
                break;

            case 2:
                num02 = Convert.ToDouble(txtcalcdisplay.Text);
                CalculationClass add = new CalculationClass();
                answer= add.Addition(num01, num02);
                txtcalcdisplay.Text = answer.ToString();
                break;

            case 3:
                num02 = Convert.ToDouble(txtcalcdisplay.Text);
                CalculationClass mult = new CalculationClass();
                answer = mult.Multiply(num01, num02);
                txtcalcdisplay.Text = answer.ToString();
                break;

            case 4:
                num02 = Convert.ToDouble(txtcalcdisplay.Text);
                CalculationClass div = new CalculationClass();
                answer = div.Div(num01, num02);
                txtcalcdisplay.Text = Convert.ToString(answer);
                break;
        }
    }

    private void btnback_Click(object sender, RoutedEventArgs e)
    {
    }

    private void btnplusdivideminus_Click(object sender, RoutedEventArgs e)
    {
    }

    private void btncomma_Click(object sender, RoutedEventArgs e)
    {
    }

    private void btngallery_Click(object sender, RoutedEventArgs e)
    {
    }

    private void btncontact_Click(object sender, RoutedEventArgs e)
    {
    }

    private void num0_Click(object sender, RoutedEventArgs e)
    {
        txtcalcdisplay.Text += "0";
        num01 = Convert.ToDouble(txtcalcdisplay.Text);
    }
}


class CalculationClass
{
    double answer;

    public double Addition(double x, double y)
    {
        answer = x + y;
        return answer;
    }

    public double Subtract(double x, double y)
    {
        answer = x - y;
        return answer;
    }

    public double Multiply(double x, double y)
    {
        answer = x * y;
        return answer;
    }

    public double Div(double x, double y)
    {
        answer = x / y;
        return answer;
    }
}

Answer 1

我不是 100% 确定，但我相当确定这与您的变量 operater 是一个 int 但您正在为其分配一个字符这一事实有关（这有效 - 字符可以分配给整数）然后将它与整数进行比较（例如做 1 == '1'）

int x = '1';
Console.WriteLine(x); // outputs 49
Console.WriteLine(x == 1); // outputs false

所以要修复它，请使用您的开关中的字符：

switch(operater){
   case '1': ...
}

或者分配整数 1,2,3,4 而不是字符 '1','2,'3','4'

private void btnadd_Click(object sender, RoutedEventArgs e)
{
    num01 = Convert.ToDouble(txtcalcdisplay.Text);
    txtcalcdisplay.Text = "";
    operater = 2; // here
}

Answer 2

因此，在您的操作员点击处理程序（+、-、*、/ 等的处理程序）中，您将 operater 变量设置为字符 '1'、'2'，等等。那么，您的 operater 变量是一个整数。但是等等，你不应该能够将 char 分配给 int？！好吧，编译器在这里做了一个隐式转换（language spec says it should）。

所以当您执行 operater = '1' 时最终发生的事情是 operater 被分配了 49（'1' 的 ASCII 值）。然后，当您到达等于按钮单击处理程序时，它会触发该 switch 语句。你猜怎么着？你没有 49 的案例。所以没有任何反应，你一直看到你的第二个数字作为屏幕上的文本。

因此，要修复它，请在您的运算符处理程序中删除您分配给 operater 的数字周围的单引号。即：

private void btnsubtract_Click(object sender, RoutedEventArgs e)
{
    num01 = Convert.ToDouble(txtcalcdisplay.Text);
    txtcalcdisplay.Text = "";
    operater = 1;  // <-- change this line to be like this, removed the single quotes
}

计算器问题：只得到我输入的第二个值

Calculator Trouble: Only getting second value I enter

c#

calculator