主要使用的是TextBox和button控件
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9 using System.Windows.Forms;
10
11 namespace WindowsFormsApplication1
12 {
13 public partial class jisuanqi : Form
14 {
15 //存储上次点击了什么按钮，0代表什么都没点击，1代表点击了数字按钮，2代表点击了运算符
16 private int prev = 0;
17 //存储中间结果
18 private decimal zjjg = 0;
19 //记录上次按的什么运算符
20 private string preysf = "+";
21 //记录上次按的是等号
22 private int denghao = 0;
23
24
25 public jisuanqi()
26 {
27 InitializeComponent();
28 }
29
30 private void button1_Click(object sender, EventArgs e)
31 {
32 Button btn = sender as Button;
33
34 //替换（如果下面文本框内容为0或者上次点击了运算符）
35 if (prev == 2 || TXTbottom.Text == "0")
36 {
37 TXTbottom.Text = btn.Text;
38 }
39 //追加（如果下面文本框内容不为0并且上次没有点击运算符）
40 else
41 {
42 TXTbottom.Text += btn.Text;
43 }
44
45 prev = 1;
46
47 }
48
49 private void button4_Click(object sender, EventArgs e)
50 {
51 Button btn = sender as Button;
52
53
54
55 //上次按了数字
56 if (prev == 1)
57 {
58 TXTTOP.Text += TXTbottom.Text + btn.Text;
59 switch (preysf)
60 {
61 case "+":
62 zjjg = zjjg + Convert.ToDecimal(TXTbottom.Text);
63 break;
64 case "-":
65 zjjg = zjjg - Convert.ToDecimal(TXTbottom.Text);
66 break;
67 case "*":
68 zjjg = zjjg * Convert.ToDecimal(TXTbottom.Text);
69 break;
70 case "/":
71 zjjg = zjjg / Convert.ToDecimal(TXTbottom.Text);
72 break;
73 }
74 TXTbottom.Text = zjjg.ToString();
75 }
76 //上次按了运算符///
77 else
78 {
79 string s = TXTTOP.Text;
80 if (s.Length >= 1)
81 {
82 s = s.Substring(0, s.Length - 1);
83 s = s + btn.Text;
84 }
85 else
86 {
87 s = "0";
88 s = s + btn.Text;
89 }
90 TXTTOP.Text = s;
91 }
92 //加号
93 prev = 2;
94 preysf = btn.Text;
95 }
96
97 private void button15_Click(object sender, EventArgs e)
98 {
99 TXTTOP.Text = "";
100 TXTbottom.Text = "0";
101 prev = 0;
102 zjjg = 0;
103 preysf = "+";
104 }
105
106 private void jisuanqi_KeyDown(object sender, KeyEventArgs e)
107 {
108
109
110 if (
111 e.KeyCode == Keys.D0 || e.KeyCode == Keys.NumPad0 ||
112 e.KeyCode == Keys.D1 || e.KeyCode == Keys.NumPad1 ||
113 e.KeyCode == Keys.D2 || e.KeyCode == Keys.NumPad2 ||
114 e.KeyCode == Keys.D3 || e.KeyCode == Keys.NumPad3 ||
115 e.KeyCode == Keys.D4 || e.KeyCode == Keys.NumPad4 ||
116 e.KeyCode == Keys.D5 || e.KeyCode == Keys.NumPad5 ||
117 e.KeyCode == Keys.D6 || e.KeyCode == Keys.NumPad6 ||
118 e.KeyCode == Keys.D7 || e.KeyCode == Keys.NumPad7 ||
119 e.KeyCode == Keys.D8 || e.KeyCode == Keys.NumPad8 ||
120 e.KeyCode == Keys.D9 || e.KeyCode == Keys.NumPad9
121 )
122 {
123 if (prev == 2 || TXTbottom.Text == "0")
124 {
125 string a = e.KeyData.ToString();
126 TXTbottom.Text = a.Substring((a.Length-1),1);
127 }
128 else
129 {
130 string a = e.KeyData.ToString();
131 TXTbottom.Text += a.Substring((a.Length - 1), 1);
132
133 }
134 prev = 1;
135 }
136 //else if (
137 // //e.KeyCode == Keys.Add || e.KeyCode == Keys.Subtract || e.KeyCode == Keys.Multiply || e.KeyCode == Keys.Divide||
138 // e.KeyCode==Keys.Shift&&e.KeyCode==Keys.D8
139 // )
140 //{
141 // MessageBox.Show(e.KeyData.ToString());
142 //}
143 else if(e.KeyCode==Keys.Back)
144 {
145 string s = TXTbottom.Text;
146 if (s.Length >= 1)
147 {
148 s = s.Substring(0, s.Length - 1);
149 }
150 else
151 {
152 s = "";
153 }
154 TXTbottom.Text = s;
155 }
156 }
157
158 private void button17_Click(object sender, EventArgs e)
159 {
160 string s = TXTbottom.Text;
161 if (s.Length >= 1)
162 {
163 s = s.Substring(0, s.Length - 1);
164 }
165 else
166 {
167 s = "";
168 }
169 TXTbottom.Text = s;
170 }
171
172 private void button14_Click(object sender, EventArgs e)//等号
173 {
174 Button btn = sender as Button;
175
176 //上次按了数字
177 if (prev == 1)
178 {
179 TXTTOP.Text += TXTbottom.Text + btn.Text;
180 switch (preysf)
181 {
182 case "+":
183 zjjg = zjjg + Convert.ToDecimal(TXTbottom.Text);
184 break;
185 case "-":
186 zjjg = zjjg - Convert.ToDecimal(TXTbottom.Text);
187 break;
188 case "*":
189 zjjg = zjjg * Convert.ToDecimal(TXTbottom.Text);
190 break;
191 case "/":
192 zjjg = zjjg / Convert.ToDecimal(TXTbottom.Text);
193 break;
194 }
195 TXTbottom.Text = zjjg.ToString();
196 }
197 //上次按了运算符///
198 else
199 {
200 string s = TXTTOP.Text;
201 if (s.Length >= 1)
202 {
203 s = s.Substring(0, s.Length - 1);
204 s = s + btn.Text;
205 }
206 else
207 {
208 s = "0";
209 s = s + btn.Text;
210 }
211 TXTbottom.Text = s;
212 }
213 //加号
214 prev = 2;
215 preysf = btn.Text;
216 TXTTOP.Text = "";
217 zjjg = 0;
218 preysf = "+";
219 denghao = 1;
220 }
221
222 private void jisuanqi_Load(object sender, EventArgs e)
223 {
224
225 }
226 }
227 }