1 public Form1()
2 {
3 InitializeComponent();
4 textBox2.Text = "0";//主显示屏
5 textBox1.Text = "";//顶端副显示屏
6 textBox3.Text = "";//中间变量，隐藏
7
8 }
9
10 private void Form1_Load(object sender, EventArgs e)
11 {
12
13 }
14 //数字按键
15 private void button21_Click(object sender, EventArgs e)
16 {
17 if (sender is Button)
18 {
19 Button btn = sender as Button;
20 if (textBox2.Text == "0")//如果主屏幕为0
21 {
22 textBox2.Text = btn.Text;//输入几就显示几
23 }
24 else
25 {
26 if (yunsuanfu)//上个按键是运算符
27 {
28 textBox2.Text = btn.Text;//主屏幕只显示本次输入的数字
29 yunsuanfu = false;
30 }
31 else
32 {
33 textBox2.Text += btn.Text;//上个按键不是运算符，主屏幕右侧累添上这个数字
34 }
35 }
36 }
37 }
38
39 //加减乘除
40 private bool yunsuanfu = false;
41 private double jieguo1 = 0;//点击加减乘除运算符显示的结果
42 private string text = "";
43 private void button26_Click(object sender, EventArgs e)
44 {
45 if (sender is Button)
46 {
47 Button btn = sender as Button;
48 text = btn.Text;
49 if(textBox3.Text=="")
50 {
51 textBox3.Text = btn.Text;
52 }
53 //判断上一步点击的是否是运算符
54 if (yunsuanfu==false)//不是运算符
55 {
56 textBox1.Text += textBox2.Text + text;
57 yunsuanfu = true;
58 if(textBox3.Text=="+")
59 {
60 jieguo1 += Convert.ToDouble(textBox2.Text);
61 textBox2.Text = jieguo1.ToString();
62 }
63 else if (textBox3.Text == "-")
64 {
65 jieguo1 -= Convert.ToDouble(textBox2.Text);
66 textBox2.Text = jieguo1.ToString();
67 }
68 else if (textBox3.Text == "*")
69 {
70 if (jieguo1 != 0)
71 {
72 jieguo1 = jieguo1 * Convert.ToDouble(textBox2.Text);
73 }
74 else
75 {
76 jieguo1 = Convert.ToDouble(textBox2.Text);
77 }
78 textBox2.Text = jieguo1.ToString();
79 }
80 else if (textBox3.Text == "/")
81 {
82 if (Convert.ToDouble(textBox2.Text) != 0)
83 {
84 if (jieguo1 != 0)
85 {
86 jieguo1 = jieguo1 / Convert.ToDouble(textBox2.Text);
87 }
88 else
89 {
90 jieguo1 = Convert.ToDouble(textBox2.Text); ;
91 }
92 textBox2.Text = jieguo1.ToString();
93 }
94 else
95 {
96 textBox2.Text = "除数不能为0";
97 }
98 }
99
100 textBox3.Text = text;
101 }
102 else
103 {
104 if (textBox1.Text.Length > 0)
105 {
106 textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1) + text;
107 textBox3.Text = text;
108 }
109 else
110 {
111 textBox3.Text = text;
112 }
113 yunsuanfu = false;
114 }
115 }
116 }
117
118 //小数点
119 private void button25_Click(object sender, EventArgs e)
120 {
121 //判断上一步点击的是否是运算符
122 if (yunsuanfu == false)//不是运算符
123 {
124 if (textBox2.Text.Contains(".") == false)
125 {
126 textBox2.Text = textBox2.Text + ".";
127 }
128 }
129 else
130 {
131 textBox2.Text = "0.";
132 yunsuanfu = false;
133 }
134 }
135
136 //等号
137 private double jieguo = 0;
138 private string text4 = "";
139 private string text5 = "";
140 private void button28_Click(object sender, EventArgs e)
141 {
142 jieguo = jieguo1;
143 jieguo1 = 0;
144 text4 = textBox3.Text;
145 textBox3.Text = "";
146 text = "";
147 if (text4 == "")
148 {
149 text4 = button28.Text;
150 }
151
152 textBox1.Clear();
153 textBox1.Text = "";
154 //判断上一步点击的是否是运算符
155 if (yunsuanfu == false)//不是运算符
156 {
157 yunsuanfu = true;
158 if (text4 == "+")
159 {
160 jieguo += Convert.ToDouble(textBox2.Text);
161 textBox2.Text = jieguo.ToString();
162 }
163 else if (text4 == "-")
164 {
165 jieguo -= Convert.ToDouble(textBox2.Text);
166 textBox2.Text = jieguo.ToString();
167 }
168 else if (text4 == "*")
169 {
170 if (jieguo != 0)
171 {
172 jieguo = jieguo * Convert.ToDouble(textBox2.Text);
173 }
174 else
175 {
176 jieguo = Convert.ToDouble(textBox2.Text);
177 }
178 textBox2.Text = jieguo.ToString();
179 }
180 else if (text4 == "/")
181 {
182 if (textBox2.Text != "0")
183 {
184 if (jieguo != 0)
185 {
186 jieguo = jieguo / Convert.ToDouble(textBox2.Text);
187 }
188 else
189 {
190 jieguo = Convert.ToDouble(textBox2.Text); ;
191 }
192 textBox2.Text = jieguo.ToString();
193 }
194 else
195 {
196 textBox2.Text = "除数不能为0";
197 }
198 }
199 else if (text4 == "=")
200 {
201 jieguo = jieguo;
202 }
203
204 text5 = text4;
205 text4 = button28.Text;
206 }
207 else
208 {
209 yunsuanfu = false;
210 double jishu = 0;
211 if (text4 == "+")
212 {
213 jishu = jieguo;
214 jieguo += jishu;
215
216 textBox2.Text = jieguo.ToString();
217 }
218 else if (text4 == "-")
219 {
220 jishu = jieguo;
221 jieguo -=jishu;
222
223 textBox2.Text = jieguo.ToString();
224 }
225 else if (text4 == "*")
226 {
227 jishu = jieguo;
228 jieguo=jieguo*jishu;
229
230 textBox2.Text = jieguo.ToString();
231 }
232 else if (text4 == "/")
233 {
234 if (jieguo != 0)
235 {
236 jishu = jieguo;
237 jieguo = jieguo / jishu;
238
239 textBox2.Text = jieguo.ToString();
240 }
241 else
242 {
243 textBox2.Text = "除数不能为0";
244 }
245 }
246 else if (text4 == "=")
247 {
248 jishu =Convert.ToDouble(textBox1.Text);
249 if (text5 == "+")
250 {
251 jieguo+=jishu ;
252 }
253 else if (text5 == "-")
254 {
255 jieguo-=jishu;
256 }
257 else if (text5 == "*")
258 {
259 jieguo *=jishu;
260 }
261 else if (text5 == "/")
262 {
263 if (jishu != 0)
264 {
265 jieguo /= jishu;
266 }
267 else
268 {
269 textBox2.Text = "除数不能为0";
270 }
271 }
272 }
273 }
274 yunsuanfu = false;
275
276 }
277 //按键C
278 private void button8_Click(object sender, EventArgs e)
279 {
280 textBox2.Clear();
281 textBox1.Clear();
282 textBox3.Clear();
283 textBox2.Text = "0";
284 textBox1.Text = "";
285 textBox3.Text = "";
286 jieguo = 0;
287 jieguo1 = 0;
288 yunsuanfu = false;
289 text = "";
290 text4 = "";
291 text5 = "";
292 }
293 //CE键
294 private void button7_Click(object sender, EventArgs e)
295 {
296
297 textBox2.Clear();
298 textBox2.Text = "0";
299 }
300 //退格键
301 private void button6_Click(object sender, EventArgs e)
302 {
303 if (textBox2.Text.Length > 1)
304 {
305 textBox2.Text = textBox2.Text.Substring(0, textBox2.Text.Length - 1);
306 }
307 else if (textBox2.Text.Length == 1)
308 {
309 textBox2.Text = textBox2.Text.Substring(0, textBox2.Text.Length - 1);
310 textBox2.Text = "0";
311 }
312 else
313 {
314 textBox2.Text = "0";
315 }
316 }
317 //主屏幕字体随个数变化而变化
318 private void textBox2_TextChanged(object sender, EventArgs e)
319 {
320 if (textBox2.Text.Length < 8)
321 {
322 this.textBox2.Font = new System.Drawing.Font("宋体", 21.75f);
323 }
324 if (textBox2.Text.Length > 8)
325 {
326 this.textBox2.Font = new System.Drawing.Font("宋体", 15f);
327 }
328 if (textBox2.Text.Length > 12)
329 {
330 this.textBox2.Font = new System.Drawing.Font("宋体", 13f);
331 }
332 if (textBox2.Text.Length > 16)
333 {
334 this.textBox2.Font = new System.Drawing.Font("宋体", 11f);
335 }
336 }
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