Winform练习题

计算器
 1 namespace WindowsFormsApplication1
 2 {
 3     public partial class Form1 : Form
 4     {
 5         public Form1()
 6         {
 7             InitializeComponent();
 8         }
 9         private void button1_Click(object sender, EventArgs e)
10         {
11             int a = Convert.ToInt32(this.textBox1.Text.Trim());
12             int b = Convert.ToInt32(this.textBox2.Text.Trim());
13             string c=this.textBox3.Text.Trim();
14             int d = 0;
15             switch(c)
16             {
17                 case"+":
18                     d = a + b;
19                     break;
20                 case"-":
21                     d = a - b;
22                     break;
23                 case"*":
24                     d = a * b;
25                     break;
26                 case"/":
27                     d = a / b;
28                     break;
29             }
30             textBox4.Text = d.ToString();
31         }
32 
33         private void button2_Click(object sender, EventArgs e)
34         {
35             string str1 = textBox1.Text;
36             string str2 = textBox2.Text;
37             int i, j, k;
38             if(!int.TryParse(str1,out i ))
39             {
40                 MessageBox.Show("第一个数字不合法");
41                 return;
42             }
43             if(int.TryParse(str2,out j)==false)
44             {
45                 MessageBox.Show("第二个数字不合法");
46                 return;
47             }
48             k = i + j;
49             textBox4.Text = Convert.ToString(k);
50         }
51     }
52 }
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