每日博客
C#
编写一个计算器，练习在窗体上添加控件、调整控件的布局，设置或修改控件属性，
编写事件处理程序的方法。
(1)新建 windows 应用程序。在窗体 Form 上拖放一个 TextBox 控件、十六个 Button 控
件，整个窗体布局如下图所示。
(2)打开代码窗口，添加如下全局变量：
double a = 0;
double b = 0;
bool c = false;
string d;
(3)双击”1”按钮，添加如下事件处理程序：
private void button1_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "1";
}
(4)双击”2”按钮，添加如下事件处理程序：
private void button2_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox2.Text = "";
c = false;
}
textBox1.Text += "2";
}
(5)双击”3”按钮，添加如下事件处理程序：
private void button3_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox3.Text = "";
c = false;
}
textBox1.Text += "3";
}
(6)双击”4”按钮，添加如下事件处理程序：
private void button4_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "4";
}
(7)双击”5”按钮，添加如下事件处理程序：
private void button5_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "5";
}
(8)双击”6”按钮，添加如下事件处理程序：
private void button6_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "6";
}
(8)双击”7”按钮，添加如下事件处理程序：
private void button7_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "7";
}
(10)双击”8”按钮，添加如下事件处理程序：
private void button8_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "8";
}
(11)双击”9”按钮，添加如下事件处理程序：
private void button9_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "9";
}
(12)双击”0”按钮，添加如下事件处理程序：
private void button12_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "0";
if (d == "/")
{
textBox1.Clear();
MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK,
MessageBoxIcon.Warning);
}
}
(13)双击”+”按钮，添加如下事件处理程序：
private void button13_Click(object sender, EventArgs e)
{
c = true;
b = double.Parse(textBox1.Text);
d = "+";
}
(14)双击”-”按钮，添加如下事件处理程序：
private void button16_Click(object sender, EventArgs e)
{
c = true;
b = double.Parse(textBox1.Text);
d = "-";
}
(15)双击”*”按钮，添加如下事件处理程序：
private void button15_Click(object sender, EventArgs e)
{
c = true;
b = double.Parse(textBox1.Text);
d = "*";
}
(16)双击”/”按钮，添加如下事件处理程序：
private void button14_Click(object sender, EventArgs e)
{
c = true;
b = double.Parse(textBox1.Text);
d = "/";
}
(17)双击”=”按钮，添加如下事件处理程序：
private void button17_Click(object sender, EventArgs e)
{
switch (d)
{
case "+": a = b + double.Parse(textBox1.Text); break;
case "-": a = b - double.Parse(textBox1.Text); break;
case "*": a = b * double.Parse(textBox1.Text); break;
case "/": a = b / double.Parse(textBox1.Text); break;
}
textBox1.Text = a + "";
c = true;
}
(18)双击”c”按钮，添加如下事件处理程序：
private void button18_Click(object sender, EventArgs e)
{
textBox1.Text = "";
}
(19)单击启动调试工具，运行计算器。
(20)在计算器中，增加四个功能键：x2，sqrt，log, ln 四个键，分别计算求平方，开方，
log，ln 值。
namespace WindowsFormsApp1
{
public partial class form1 : Form
{
double a = 0;
double b = 0;
bool c = false;
string d;
public form1(){InitializeComponent();}
private void form1_Load(object sender, EventArgs e){}
private void textBox1_TextChanged(object sender, EventArgs e){}
private void button10_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "2";
}
private void button1_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "7";
}
private void button3_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "8";
}
private void button4_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "9";
}
private void button2_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "4";
}
private void button7_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "1";
}
private void button13_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "3";
}
private void button9_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "5";
}
private void button12_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "6";
}
private void button8_Click(object sender, EventArgs e)
{
if (c == true)
{
textBox1.Text = "";
c = false;
}
textBox1.Text += "0";
if (d == "/")
{
textBox1.Clear();
MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
private void button14_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true; b = double.Parse(textBox1.Text);
d = "+";
}
}
private void button19_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true; b = double.Parse(textBox1.Text);
d = "-";
}
}
private void button18_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true; b = double.Parse(textBox1.Text);
d = "*";
}
}
private void button6_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true; b = double.Parse(textBox1.Text);
d = "/";
}
}
private void button11_Click(object sender, EventArgs e)
{
switch (d)
{
case "+": a = b + double.Parse(textBox1.Text); break;
case "-": a = b - double.Parse(textBox1.Text); break;
case "*": a = b * double.Parse(textBox1.Text); break;
case "/": a = b / double.Parse(textBox1.Text); break;
case "x^2": a = b * b; break;
case "sqrt": a = Math.Sqrt(b); break;
case "log": a = Math.Log10(b); break;
case "ln": a = Math.Log(b); break;
}
textBox1.Text = a + "";
c = true;
}
private void button17_Click(object sender, EventArgs e){textBox1.Text = "";}
private void button5_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true;
b = double.Parse(textBox1.Text);
d = "x^2";
}
}
private void button15_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true;
b = double.Parse(textBox1.Text);
d = "sqrt";
}
}
private void button16_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true;
b = double.Parse(textBox1.Text);
d = "log";
}
}
private void button20_Click(object sender, EventArgs e)
{
if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
else
{
c = true;
b = double.Parse(textBox1.Text);
d = "ln";
}
}
}
}
