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WinForm 小练习计算器（已简化）

  1 bool a; //判断上一次按键是加减乘除还是数字
  2         string c = ""; //判断加减乘除操作
  3         decimal f;//记录第一个值以及接收运算结果
  4         /// <summary>
  5         /// 数字按键
  6         /// </summary>
  7         /// <param name="sender"></param>
  8         /// <param name="e"></param>
  9         private void button1_Click(object sender, EventArgs e)
 10         {
 11             Button b = sender as Button;//sender是事件的主体，e是事件的数据，这里把sender转换为button类的目的是获取用户操作，因为事件主体是一个button，所以sender可以转换为button类。
 12             if (textBox2.Text == "0" || a == false)
 13             {
 14                 textBox2.Text = b.Text;
 15             }
 16             else
 17             {
 18                 textBox2.Text += b.Text;
 19             }
 20             if (textBox1.Text == "")
 21             {
 22                 f = Convert.ToDecimal(textBox2.Text);
 23             }
 24             a = true;
 25         }
 26         /// <summary>
 27         /// 加减乘除
 28         /// </summary>
 29         /// <param name="sender"></param>
 30         /// <param name="e"></param>
 31         private void button4_Click(object sender, EventArgs e)
 32         {
 33             Button b = sender as Button;
 34             if (textBox2.Text.LastIndexOf(".") == (textBox2.Text.Length - 1))
 35             {
 36                 textBox2.Text = textBox2.Text.Substring(0, (textBox2.Text.Length - 1));
 37             }           
 38             if (a == false)
 39             {
 40                 textBox1.Text = textBox1.Text.Substring(0, (textBox1.Text.Length - 1)) + b.Text;
 41             }
 42             else
 43             {
 44                 textBox1.Text += textBox2.Text + b.Text;
 45                 if (c == "1")
 46                 {
 47                     f = f + Convert.ToDecimal(textBox2.Text);
 48                 }
 49                 else if (c == "2")
 50                 {
 51                     f = f - Convert.ToDecimal(textBox2.Text);
 52                 }
 53                 else if (c == "3")
 54                 {
 55                     f = f * Convert.ToDecimal(textBox2.Text);
 56                 }
 57                 else if (c == "4")
 58                 {
 59                     f = f / Convert.ToDecimal(textBox2.Text);
 60                 }
 61                 textBox2.Text = f.ToString();
 62             }
 63             if (b.Text == "+")
 64             {
 65                 c = "1";
 66             }
 67             else if (b.Text == "-")
 68             {
 69                 c = "2";
 70             }
 71             else if (b.Text == "*")
 72             {
 73                 c = "3";
 74             }
 75             else if (b.Text == "/")
 76             {
 77                 c = "4";
 78             }
 79             a = false;
 80         }
 81         /// <summary>
 82         /// 点
 83         /// </summary>
 84         /// <param name="sender"></param>
 85         /// <param name="e"></param>
 86         private void button17_Click(object sender, EventArgs e)
 87         {
 88             if (textBox2.Text.Contains(".") == false)
 89             {
 90                 textBox2.Text += ".";
 91             }
 92         }
 93         /// <summary>
 94         /// 等于
 95         /// </summary>
 96         /// <param name="sender"></param>
 97         /// <param name="e"></param>
 98         private void button15_Click(object sender, EventArgs e)
 99         {
100             if (textBox2.Text.LastIndexOf(".") == (textBox2.Text.Length - 1))
101             {
102                 textBox2.Text = textBox2.Text.Substring(0, (textBox2.Text.Length - 1));
103             }
104             if (c == "1")
105             {
106                 f = f + Convert.ToDecimal(textBox2.Text);
107             }
108             else if (c == "2")
109             {
110                 f = f - Convert.ToDecimal(textBox2.Text);
111             }
112             else if (c == "3")
113             {
114                 f = f * Convert.ToDecimal(textBox2.Text);
115             }
116             else if (c == "4")
117             {
118                 f = f / Convert.ToDecimal(textBox2.Text);
119             }
120             textBox1.Text = "";
121             textBox2.Text = f.ToString();
122         }
123         /// <summary>
124         /// 清空
125         /// </summary>
126         /// <param name="sender"></param>
127         /// <param name="e"></param>
128         private void button14_Click(object sender, EventArgs e)
129         {
130             textBox1.Text = "";
131             textBox2.Text = "0";
132             a = true;
133             c = "";
134         }

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原文地址：https://www.cnblogs.com/mazhijie/p/5618524.html

WinForm 小练习 计算器（已简化）

WinForm 小练习计算器（已简化）