WPF設計簡單計算器
本文中設計的計算器僅支持單次雙目運算，可連續計算，
實驗要求、
1、在wpf專案中編程實作一個簡單計算器，具體要求如下：
1）實作+，-，*，/運算
2）可以連續進行計算，
效果如圖：
*該程式中數字通過點擊對應按鈕輸入，運算子包含四種常用運算，除此之外還有退格以及清空操作，輸入以及運算結果在上方文本框內顯示
1.首先，該程式中只涉及單次運算，所以我們可以在隱藏檔案里宣告兩個全域變數來相應的保存operation前后兩個數（字串），
string num1 = null; //運算子之前的數
string num2 = null; //運算子之后的數
string ope = null; //運算子
2.每次鍵入一個位數要判斷放在num1里還是num2里，
private void button1_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button1.Content;
textBox.Text = num1;
}
else
{
num2 += button1.Content;
textBox.Text = num2;
}
}
3.鍵入運算子是對變數ope賦值(因為是單次計算，所以運算子沒必要在文本框里顯示)
private void buttonADD_Click(object sender, RoutedEventArgs e)
{
ope = "+";
}
4.CE清空操作，將textbox中的內容以及所有變數清空
private void buttonCE_Click(object sender, RoutedEventArgs e)
{
//if (ope == null)
//{
// num1 = textBox.Text;
//}
//else
//{
// num2 = textBox.Text;
//}
this.textBox.Text = "";
num1 = null;
num2 = null;
ope = null;
}
5.退格操作
private void buttonBK_Click(object sender, RoutedEventArgs e)
{
string s = textBox.Text;
int len = s.Length;
if (textBox.Text != null && len >= 1)
textBox.Text = s.Remove(len - 1);
if (ope == null)
{
num1 = textBox.Text;
}
else
{
num2 = textBox.Text;
}
}
6.計算結果（利用switch case ）
private void buttonEQ_Click(object sender, RoutedEventArgs e)
{
switch (ope)
{
case "+":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) + Convert.ToDouble(num2));
break;
case "-":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) - Convert.ToDouble(num2));
break;
case "*":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) * Convert.ToDouble(num2));
break;
case "/":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) / Convert.ToDouble(num2));
break;
}
num1 = textBox.Text;
num2 = null;
ope = null;
}
將結果值賦給num1來實作連續計算.
效果如如下：
完整代碼如下：
*xaml
Window x:Class="小小計算器.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="計算器" Height="382" Width="362">
<Grid Height="335">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="48*" />
<ColumnDefinition Width="23*" />
</Grid.ColumnDefinitions>
<Button Content="CE" Height="30" HorizontalAlignment="Left" Margin="62,87,0,0" Name="buttonCE" VerticalAlignment="Top" Width="41" Click="buttonCE_Click" />
<Button Content="＜-" Height="29" HorizontalAlignment="Left" Margin="118,87,0,0" Name="buttonBK" VerticalAlignment="Top" Width="45" Click="buttonBK_Click" />
<Button Content="." Height="29" HorizontalAlignment="Left" Margin="185,87,0,0" Name="buttonDOT" VerticalAlignment="Top" Width="46" Click="buttonDOT_Click" />
<Button Content="+" Height="28" HorizontalAlignment="Left" Margin="7,87,0,0" Name="buttonADD" VerticalAlignment="Top" Width="47" Click="buttonADD_Click" Grid.Column="1" />
<Button Content="1" Height="30" HorizontalAlignment="Left" Margin="62,136,0,0" Name="button1" VerticalAlignment="Top" Width="41" Click="button1_Click" />
<Button Content="2" Height="30" HorizontalAlignment="Left" Margin="118,136,0,0" Name="button2" VerticalAlignment="Top" Width="45" Click="button2_Click" />
<Button Content="3" Height="30" HorizontalAlignment="Left" Margin="185,136,0,0" Name="button3" VerticalAlignment="Top" Width="46" Click="button3_Click" RenderTransformOrigin="1.217,0.437" />
<Button Content="-" Height="30" HorizontalAlignment="Left" Margin="7,136,0,0" Name="buttonSUB" VerticalAlignment="Top" Width="47" Click="buttonSUB_Click" Grid.Column="1" />
<Button Content="4" Height="30" HorizontalAlignment="Left" Margin="62,186,0,0" Name="button4" VerticalAlignment="Top" Width="41" Click="button4_Click" />
<Button Content="5" Height="30" HorizontalAlignment="Left" Margin="118,186,0,0" Name="button5" VerticalAlignment="Top" Width="45" Click="button5_Click" />
<Button Content="6" Height="30" HorizontalAlignment="Left" Margin="185,186,0,0" Name="button6" VerticalAlignment="Top" Width="46" Click="button6_Click" />
<Button Content="*" Height="30" HorizontalAlignment="Left" Margin="7,186,0,0" Name="buttonMUP" VerticalAlignment="Top" Width="47" Click="buttonMUP_Click" Grid.Column="1" />
<Button Content="7" Height="30" HorizontalAlignment="Left" Margin="62,231,0,0" Name="button7" VerticalAlignment="Top" Width="40" Click="button7_Click" />
<Button Content="8" Height="30" HorizontalAlignment="Left" Margin="118,231,0,0" Name="button8" VerticalAlignment="Top" Width="45" Click="button8_Click" />
<Button Content="9" Height="30" HorizontalAlignment="Left" Margin="185,231,0,0" Name="button9" VerticalAlignment="Top" Width="46" Click="button9_Click" />
<Button Content="/" Height="30" HorizontalAlignment="Left" Margin="7,231,0,0" Name="buttonDIV" VerticalAlignment="Top" Width="47" Click="buttonDIV_Click" Grid.Column="1" />
<Button Content="0" Height="25" HorizontalAlignment="Left" Margin="62,281,0,0" Name="button0" VerticalAlignment="Top" Width="101" Click="button0_Click" />
<Button Content="=" Height="25" HorizontalAlignment="Right" Margin="0,281,59.2,0" Name="buttonEQ" VerticalAlignment="Top" Width="111" Grid.ColumnSpan="2" Click="buttonEQ_Click" RenderTransformOrigin="-0.085,0.493" />
<TextBox Grid.ColumnSpan="2" Height="32" HorizontalAlignment="Left" Margin="88,30,0,0" Name="textBox" VerticalAlignment="Top" Width="173" />
</Grid>
</Window>
.cs檔案
namespace 小小計算器
{
/// <summary>
/// MainWindow.xaml 的互動邏輯
/// </summary>
public partial class MainWindow : Window
{
string num1 = null; //運算子之前的數
string num2 = null; //運算子之后的數
string ope = null; //運算子
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button1.Content;
textBox.Text = num1;
}
else
{
num2 += button1.Content;
textBox.Text = num2;
}
}
private void button2_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button2.Content;
textBox.Text = num1;
}
else
{
num2 += button2.Content;
textBox.Text = num2;
}
}
private void button3_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button3.Content;
textBox.Text = num1;
}
else
{
num2 += button3.Content;
textBox.Text = num2;
}
}
private void button4_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button4.Content;
textBox.Text = num1;
}
else
{
num2 += button4.Content;
textBox.Text = num2;
}
}
private void button5_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button5.Content;
textBox.Text = num1;
}
else
{
num2 += button5.Content;
textBox.Text = num2;
}
}
private void button6_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button6.Content;
textBox.Text = num1;
}
else
{
num2 += button6.Content;
textBox.Text = num2;
}
}
private void button7_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button7.Content;
textBox.Text = num1;
}
else
{
num2 += button7.Content;
textBox.Text = num2;
}
}
private void button8_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button8.Content;
textBox.Text = num1;
}
else
{
num2 += button8.Content;
textBox.Text = num2;
}
}
private void button9_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button9.Content;
textBox.Text = num1;
}
else
{
num2 += button9.Content;
textBox.Text = num2;
}
}
private void button0_Click(object sender, RoutedEventArgs e)
{
if (ope == null)
{
num1 += button0.Content;
textBox.Text = num1;
}
else
{
num2 += button0.Content;
textBox.Text = num2;
}
}
private void buttonADD_Click(object sender, RoutedEventArgs e)
{
ope = "+";
}
private void buttonSUB_Click(object sender, RoutedEventArgs e)
{
ope = "-";
}
private void buttonMUP_Click(object sender, RoutedEventArgs e)
{
ope = "*";
}
private void buttonDIV_Click(object sender, RoutedEventArgs e)
{
ope = "/";
}
private void buttonDOT_Click(object sender, RoutedEventArgs e)
{
if (ope == null &&!num1.Contains(".")) //如果num中已有小數點，則不允許再輸入.
{
num1 += buttonDOT.Content;
textBox.Text = num1;
}
if(ope!=null&&!num2.Contains("."))
{
num2 += buttonDOT.Content;
textBox.Text = num2;
}
}
private void buttonCE_Click(object sender, RoutedEventArgs e)
{
//if (ope == null)
//{
// num1 = textBox.Text;
//}
//else
//{
// num2 = textBox.Text;
//}
this.textBox.Text = "";
num1 = null;
num2 = null;
ope = null;
}
private void buttonBK_Click(object sender, RoutedEventArgs e)
{
string s = textBox.Text;
int len = s.Length;
if (textBox.Text != null && len >= 1)
textBox.Text = s.Remove(len - 1);
if (ope == null)
{
num1 = textBox.Text;
}
else
{
num2 = textBox.Text;
}
}
private void buttonEQ_Click(object sender, RoutedEventArgs e)
{
switch (ope)
{
case "+":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) + Convert.ToDouble(num2));
break;
case "-":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) - Convert.ToDouble(num2));
break;
case "*":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) * Convert.ToDouble(num2));
break;
case "/":
textBox.Text = Convert.ToString(Convert.ToDouble(num1) / Convert.ToDouble(num2));
break;
}
num1 = textBox.Text;
num2 = null;
ope = null;
}
}
}
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