c#计算器

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;   namespace 计算器 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }             char p=' ';         int v1=0,v2=0;         private void button3_Click(object sender, EventArgs e)         {             textBox1.Text = "";             p = '+';         }         private void button4_Click(object sender, EventArgs e)         {             if (p == '+')             {                 textBox1.Text = "";                 v1 = v1 + v2;                 textBox1.Text = v1 + "";             }         }         private void button5_Click(object sender, EventArgs e)         {             if (p == ' ')             {                 v1 = v1 * 10 + 1;                 textBox1.Text = v1 + "";             }             else             {                 v2 = v2 * 10 + 1;                 textBox1.Text = v2 + "";             }         }           private void button6_Click(object sender, EventArgs e)         {             if (p == ' ')             {                 v1 = v1 * 10 + 2;                 textBox1.Text = v1 + "";             }             else             {                 v2 = v2 * 10 + 2;                 textBox1.Text = v2 + "";             }         }                                                                                                                                       } }