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我是一個編程noob，我似乎無法讓這個計算器正常工作。我已經編寫了所有的按鈕，並允許用戶從鍵盤輸入（我沒有放入代碼摘錄，因爲它的無關緊要），但正如標題所暗示的那樣，等於按鈕不會有多於一個的總和。我不確定是什麼導致了這個問題。任何建議，將不勝感激。簡單的計算器禍（無法讓等號按鈕多次工作）
這是我的代碼。
public partial class MainWindow : Window
{
string input = string.Empty; //String storing user input
string operand1 = string.Empty; //String storing first operand
string operand2 = string.Empty; //String storing second operand
char operation; //char for operarion
double result = 0.0; //calculated result
bool operationCompleted = false;
public MainWindow()
{
InitializeComponent();
}
private void btn_Zero_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "0";
this.textBox.Text += input;
if(operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_One_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "1";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Two_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "2";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Three_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "3";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Four_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "4";
this.textBox.Text += input;
if (operationCompleted)
{
input = string.Empty;
textBox.Text = string.Empty;
operand1 = string.Empty;
operand2 = string.Empty;
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Five_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "5";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Six_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "6";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Seven_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "7";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Eight_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "8";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Nine_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += "9";
this.textBox.Text += input;
if (operationCompleted)
{
btn_Clear_Click(sender, e);
operationCompleted = false;
}
btn_Equals.Focus();
}
private void btn_Dot_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
input += ".";
this.textBox.Text += input;
btn_Equals.Focus();
}
private void btn_Minus_Click(object sender, RoutedEventArgs e)
{
operand1 = input;
operation += '-';
input = string.Empty;
textBox.Text = string.Empty;
btn_Equals.Focus();
}
private void btn_Plus_Click(object sender, RoutedEventArgs e)
{
operand1 = input;
operation += '+';
input = string.Empty;
textBox.Text = string.Empty;
btn_Equals.Focus();
}
private void btn_Multiply_Click(object sender, RoutedEventArgs e)
{
operand1 = input;
operation += '*';
input = string.Empty;
textBox.Text = string.Empty;
btn_Equals.Focus();
}
private void btn_Divide_Click(object sender, RoutedEventArgs e)
{
operand1 = input;
operation += '/';
input = string.Empty;
textBox.Text = string.Empty;
btn_Equals.Focus();
}
// The equals works for the first sum but not for any after it
private void btn_Equals_Click(object sender, RoutedEventArgs e)
{
{
operand2 = input;
double num1, num2;
double.TryParse(operand1, out num1);
double.TryParse(operand2, out num2);
if (operation == '+')
{
result = num1 + num2;
textBox.Text = result.ToString();
}
else if (operation == '-')
{
result = num1 - num2;
textBox.Text = result.ToString();
}
else if (operation == '*')
{
result = num1 * num2;
textBox.Text = result.ToString();
}
else if (operation == '/')
{
if (num1 != 0 || num2 != 0)
{
result = num1/num2;
textBox.Text = result.ToString();
}
else
{
textBox.Text = "Cannot divide by zero";
}
}
operationCompleted = true;
this.Focus();
}
}
private void btn_Clear_Click(object sender, RoutedEventArgs e)
{
this.textBox.Text = "";
this.input = string.Empty;
this.operand1 = string.Empty;
this.operand2 = string.Empty;
this.result = 0.0;
operationCompleted = false;
}
}
我認爲這與你的'operation'變量有關。你聲明它是一個'char'，但是你每次按下一個操作符按鈕就會添加它，這會「破壞」它的狀態。你應該使用'='而不是'+ ='或者在計算之間清除它。 –