这是一个计算器的简单实现

  1using System;
  2using System.Drawing;
  3using System.Collections;
  4using System.ComponentModel;
  5using System.Windows.Forms;
  6using System.Data;
  7
  8namespace Calc
  9{
 10    /**//// <summary>
 11    /// 这是一个计算器的简单实现。
 12    /// </summary>
 13    public class CalcForm : System.Windows.Forms.Form
 14    {
 15        private System.Windows.Forms.Button btn_0;
 16        private System.Windows.Forms.Button btn_1;
 17        private System.Windows.Forms.Button btn_2;
 18        private System.Windows.Forms.Button btn_3;
 19        private System.Windows.Forms.Button btn_4;
 20        private System.Windows.Forms.Button btn_5;
 21        private System.Windows.Forms.Button btn_6;
 22        private System.Windows.Forms.Button btn_7;
 23        private System.Windows.Forms.Button btn_8;
 24        private System.Windows.Forms.Button btn_9;
 25        private System.Windows.Forms.Button btn_add;
 26        private System.Windows.Forms.Button btn_sub;
 27        private System.Windows.Forms.Button btn_mul;
 28        private System.Windows.Forms.Button btn_div;
 29        private System.Windows.Forms.Button btn_sqrt;
 30        private System.Windows.Forms.Button btn_sign;
 31        private System.Windows.Forms.Button btn_equ;
 32        private System.Windows.Forms.Button btn_dot;
 33        private System.Windows.Forms.Button btn_rev;
 34        private System.Windows.Forms.TextBox txtShow;
 35        private System.Windows.Forms.Button btn_sqr;
 36        /**//// <summary>
 37        /// 必需的设计器变量。
 38        /// </summary>
 39        private System.ComponentModel.Container components = null;
 40
 41        public CalcForm()
 42        {
 43            //
 44            // Windows 窗体设计器支持所必需的
 45            //
 46            InitializeComponent();
 47
 48            //
 49            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
 50            //
 51        }
 52
 53        /**//// <summary>
 54        /// 清理所有正在使用的资源。
 55        /// </summary>
 56        protected override void Dispose( bool disposing )
 57        {
 58            if( disposing )
 59            {
 60                if (components != null) 
 61                {
 62                    components.Dispose();
 63                }
 64            }
 65            base.Dispose( disposing );
 66        }
 67
 68        Windows Form Designer generated code#region Windows Form Designer generated code
 69        /**//// <summary>
 70        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 71        /// 此方法的内容。
 72        /// </summary>
 73        private void InitializeComponent()
 74        {
 75            this.btn_9 = new System.Windows.Forms.Button();
 76            this.txtShow = new System.Windows.Forms.TextBox();
 77            this.btn_8 = new System.Windows.Forms.Button();
 78            this.btn_7 = new System.Windows.Forms.Button();
 79            this.btn_div = new System.Windows.Forms.Button();
 80            this.btn_sqrt = new System.Windows.Forms.Button();
 81            this.btn_4 = new System.Windows.Forms.Button();
 82            this.btn_5 = new System.Windows.Forms.Button();
 83            this.btn_6 = new System.Windows.Forms.Button();
 84            this.btn_1 = new System.Windows.Forms.Button();
 85            this.btn_2 = new System.Windows.Forms.Button();
 86            this.btn_3 = new System.Windows.Forms.Button();
 87            this.btn_0 = new System.Windows.Forms.Button();
 88            this.btn_mul = new System.Windows.Forms.Button();
 89            this.btn_sub = new System.Windows.Forms.Button();
 90            this.btn_sign = new System.Windows.Forms.Button();
 91            this.btn_equ = new System.Windows.Forms.Button();
 92            this.btn_add = new System.Windows.Forms.Button();
 93            this.btn_dot = new System.Windows.Forms.Button();
 94            this.btn_sqr = new System.Windows.Forms.Button();
 95            this.btn_rev = new System.Windows.Forms.Button();
 96            this.SuspendLayout();
 97            // 
 98            // btn_9
 99            // 
100            this.btn_9.Location = new System.Drawing.Point(136, 48);
101            this.btn_9.Name = "btn_9";
102            this.btn_9.Size = new System.Drawing.Size(48, 23);
103            this.btn_9.TabIndex = 0;
104            this.btn_9.Tag = "9";
105            this.btn_9.Text = "9";
106            this.btn_9.Click += new System.EventHandler(this.btn_0_Click);
107            // 
108            // txtShow
109            // 
110            this.txtShow.Location = new System.Drawing.Point(8, 8);
111            this.txtShow.Name = "txtShow";
112            this.txtShow.ReadOnly = true;
113            this.txtShow.Size = new System.Drawing.Size(304, 25);
114            this.txtShow.TabIndex = 1;
115            this.txtShow.Text = "";
116            this.txtShow.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
117            // 
118            // btn_8
119            // 
120            this.btn_8.Location = new System.Drawing.Point(72, 48);
121            this.btn_8.Name = "btn_8";
122            this.btn_8.Size = new System.Drawing.Size(48, 23);
123            this.btn_8.TabIndex = 2;
124            this.btn_8.Tag = "8";
125            this.btn_8.Text = "8";
126            this.btn_8.Click += new System.EventHandler(this.btn_0_Click);
127            // 
128            // btn_7
129            // 
130            this.btn_7.Location = new System.Drawing.Point(8, 48);
131            this.btn_7.Name = "btn_7";
132            this.btn_7.Size = new System.Drawing.Size(48, 23);
133            this.btn_7.TabIndex = 3;
134            this.btn_7.Tag = "7";
135            this.btn_7.Text = "7";
136            this.btn_7.Click += new System.EventHandler(this.btn_0_Click);
137            // 
138            // btn_div
139            // 
140            this.btn_div.Location = new System.Drawing.Point(200, 48);
141            this.btn_div.Name = "btn_div";
142            this.btn_div.Size = new System.Drawing.Size(48, 23);
143            this.btn_div.TabIndex = 4;
144            this.btn_div.Text = "/";
145            this.btn_div.Click += new System.EventHandler(this.btn_div_Click);
146            // 
147            // btn_sqrt
148            // 
149            this.btn_sqrt.Location = new System.Drawing.Point(264, 48);
150            this.btn_sqrt.Name = "btn_sqrt";
151            this.btn_sqrt.Size = new System.Drawing.Size(48, 23);
152            this.btn_sqrt.TabIndex = 5;
153            this.btn_sqrt.Text = "sqrt";
154            this.btn_sqrt.Click += new System.EventHandler(this.btn_sqrt_Click);
155            // 
156            // btn_4
157            // 
158            this.btn_4.Location = new System.Drawing.Point(8, 88);
159            this.btn_4.Name = "btn_4";
160            this.btn_4.Size = new System.Drawing.Size(48, 23);
161            this.btn_4.TabIndex = 6;
162            this.btn_4.Tag = "4";
163            this.btn_4.Text = "4";
164            this.btn_4.Click += new System.EventHandler(this.btn_0_Click);
165            // 
166            // btn_5
167            // 
168            this.btn_5.Location = new System.Drawing.Point(72, 88);
169            this.btn_5.Name = "btn_5";
170            this.btn_5.Size = new System.Drawing.Size(48, 23);
171            this.btn_5.TabIndex = 7;
172            this.btn_5.Tag = "5";
173            this.btn_5.Text = "5";
174            this.btn_5.Click += new System.EventHandler(this.btn_0_Click);
175            // 
176            // btn_6
177            // 
178            this.btn_6.Location = new System.Drawing.Point(136, 88);
179            this.btn_6.Name = "btn_6";
180            this.btn_6.Size = new System.Drawing.Size(48, 23);
181            this.btn_6.TabIndex = 8;
182            this.btn_6.Tag = "6";
183            this.btn_6.Text = "6";
184            this.btn_6.Click += new System.EventHandler(this.btn_0_Click);
185            // 
186            // btn_1
187            // 
188            this.btn_1.Location = new System.Drawing.Point(8, 128);
189            this.btn_1.Name = "btn_1";
190            this.btn_1.Size = new System.Drawing.Size(48, 23);
191            this.btn_1.TabIndex = 9;
192            this.btn_1.Tag = "1";
193            this.btn_1.Text = "1";
194            this.btn_1.Click += new System.EventHandler(this.btn_0_Click);
195            // 
196            // btn_2
197            // 
198            this.btn_2.Location = new System.Drawing.Point(72, 128);
199            this.btn_2.Name = "btn_2";
200            this.btn_2.Size = new System.Drawing.Size(48, 23);
201            this.btn_2.TabIndex = 10;
202            this.btn_2.Tag = "2";
203            this.btn_2.Text = "2";
204            this.btn_2.Click += new System.EventHandler(this.btn_0_Click);
205            // 
206            // btn_3
207            // 
208            this.btn_3.Location = new System.Drawing.Point(136, 128);
209            this.btn_3.Name = "btn_3";
210            this.btn_3.Size = new System.Drawing.Size(48, 23);
211            this.btn_3.TabIndex = 11;
212            this.btn_3.Tag = "3";
213            this.btn_3.Text = "3";
214            this.btn_3.Click += new System.EventHandler(this.btn_0_Click);
215            // 
216            // btn_0
217            // 
218            this.btn_0.Location = new System.Drawing.Point(8, 168);
219            this.btn_0.Name = "btn_0";
220            this.btn_0.Size = new System.Drawing.Size(48, 23);
221            this.btn_0.TabIndex = 12;
222            this.btn_0.Tag = "0";
223            this.btn_0.Text = "0";
224            this.btn_0.Click += new System.EventHandler(this.btn_0_Click);
225            // 
226            // btn_mul
227            // 
228            this.btn_mul.Location = new System.Drawing.Point(200, 88);
229            this.btn_mul.Name = "btn_mul";
230            this.btn_mul.Size = new System.Drawing.Size(48, 23);
231            this.btn_mul.TabIndex = 13;
232            this.btn_mul.Text = "*";
233            this.btn_mul.Click += new System.EventHandler(this.btn_mul_Click);
234            // 
235            // btn_sub
236            // 
237            this.btn_sub.Location = new System.Drawing.Point(200, 128);
238            this.btn_sub.Name = "btn_sub";
239            this.btn_sub.Size = new System.Drawing.Size(48, 23);
240            this.btn_sub.TabIndex = 14;
241            this.btn_sub.Text = "-";
242            this.btn_sub.Click += new System.EventHandler(this.btn_sub_Click);
243            // 
244            // btn_sign
245            // 
246            this.btn_sign.Location = new System.Drawing.Point(72, 168);
247            this.btn_sign.Name = "btn_sign";
248            this.btn_sign.Size = new System.Drawing.Size(48, 23);
249            this.btn_sign.TabIndex = 15;
250            this.btn_sign.Text = "+/-";
251            this.btn_sign.Click += new System.EventHandler(this.btn_sign_Click);
252            // 
253            // btn_equ
254            // 
255            this.btn_equ.Location = new System.Drawing.Point(264, 168);
256            this.btn_equ.Name = "btn_equ";
257            this.btn_equ.Size = new System.Drawing.Size(48, 23);
258            this.btn_equ.TabIndex = 16;
259            this.btn_equ.Text = "=";
260            this.btn_equ.Click += new System.EventHandler(this.btn_equ_Click);
261            // 
262            // btn_add
263            // 
264            this.btn_add.Location = new System.Drawing.Point(200, 168);
265            this.btn_add.Name = "btn_add";
266            this.btn_add.Size = new System.Drawing.Size(48, 23);
267            this.btn_add.TabIndex = 17;
268            this.btn_add.Text = "+";
269            this.btn_add.Click += new System.EventHandler(this.btn_add_Click);
270            // 
271            // btn_dot
272            // 
273            this.btn_dot.Location = new System.Drawing.Point(136, 168);
274            this.btn_dot.Name = "btn_dot";
275            this.btn_dot.Size = new System.Drawing.Size(48, 23);
276            this.btn_dot.TabIndex = 18;
277            this.btn_dot.Text = ".";
278            this.btn_dot.Click += new System.EventHandler(this.btn_dot_Click);
279            // 
280            // btn_sqr
281            // 
282            this.btn_sqr.Location = new System.Drawing.Point(264, 88);
283            this.btn_sqr.Name = "btn_sqr";
284            this.btn_sqr.Size = new System.Drawing.Size(48, 23);
285            this.btn_sqr.TabIndex = 19;
286            this.btn_sqr.Text = "sqr";
287            this.btn_sqr.Click += new System.EventHandler(this.btn_sqr_Click);
288            // 
289            // btn_rev
290            // 
291            this.btn_rev.Location = new System.Drawing.Point(264, 128);
292            this.btn_rev.Name = "btn_rev";
293            this.btn_rev.Size = new System.Drawing.Size(48, 23);
294            this.btn_rev.TabIndex = 20;
295            this.btn_rev.Text = "1/x";
296            this.btn_rev.Click += new System.EventHandler(this.btn_rev_Click);
297            // 
298            // CalcForm
299            // 
300            this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
301            this.ClientSize = new System.Drawing.Size(322, 202);
302            this.Controls.AddRange(new System.Windows.Forms.Control[] {
303                                                                          this.btn_rev,
304                                                                          this.btn_sqr,
305                                                                          this.btn_dot,
306                                                                          this.btn_add,
307                                                                          this.btn_equ,
308                                                                          this.btn_sign,
309                                                                          this.btn_sub,
310                                                                          this.btn_mul,
311                                                                          this.btn_0,
312                                                                          this.btn_3,
313                                                                          this.btn_2,
314                                                                          this.btn_1,
315                                                                          this.btn_6,
316                                                                          this.btn_5,
317                                                                          this.btn_4,
318                                                                          this.btn_sqrt,
319                                                                          this.btn_div,
320                                                                          this.btn_7,
321                                                                          this.btn_8,
322                                                                          this.txtShow,
323                                                                          this.btn_9});
324            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
325            this.MaximizeBox = false;
326            this.Name = "CalcForm";
327            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
328            this.Text = "计算器";
329            this.ResumeLayout(false);
330
331        }
332        #endregion
333
334        public const int NULL = 0;    // 定义操作码
335        public const int ADD = 1;
336        public const int SUB = 2;
337        public const int MUL = 3;
338        public const int DIV = 4;
339        public const int SQR = 5;
340        public const int SQRT = 6;
341        public const int NODOT  = 0;    // 定义是否点击了小数点
342        public const int HASDOT = 1;
343        private double res = 0;        // 记录结果数
344        private double tmp = 0;        // 当前输入的操作数
345        private int opt = NULL;        // 记录操作码
346        private int dot = NODOT;    // 记录是否点击了小数点
347        private int num = 0;        // 记录输入操作数的个数
348        private int dotnum = 0;        // 记录小数点部分的个数
349        /**//// <summary>
350        /// 应用程序的主入口点。
351        /// </summary>
352        [STAThread]
353        static void Main() 
354        {
355            Application.Run(new CalcForm());
356        }
357
358        /**//// <summary>
359        /// 当点击一个数字按钮的时候，需要进行判断，如果没有点击
360        /// 小数点，那么就把原来的数值扩大10倍后再加上当前的数值，
361        /// 如果点击了小数点，那么就将当前的数值除以一个权数，再
362        /// 加上原来的数值，得到新的数值。
363        /// </summary>
364        /// <param name="sender"></param>
365        /// <param name="e"></param>
366        private void btn_0_Click(object sender, System.EventArgs e)
367        {
368            System.Windows.Forms.Button btnTmp;
369            double i;
370
371            btnTmp = sender as System.Windows.Forms.Button;
372            if (btnTmp != null)
373            {
374                if (dot == NODOT)
375                {
376                    // 没有点击小数点
377                    i = double.Parse(btnTmp.Tag.ToString());
378                    tmp = tmp * 10 + i;
379                    txtShow.Text = tmp.ToString();
380                }
381                else
382                {
383                    // 点击了小数点
384                    dotnum++;
385                    // 生成小数部分的新的数值
386                    i = double.Parse(btnTmp.Tag.ToString()) / System.Math.Pow(10,dotnum);
387                    tmp = tmp + i;
388                    txtShow.Text = tmp.ToString();
389                }
390            }
391        }
392
393        private void btn_equ_Click(object sender, System.EventArgs e)
394        {
395            // 生成结果
396            if (num == 0)
397            {
398                res = 0;
399                tmp = 0;
400                txtShow.Text = res.ToString();
401                return;
402            }
403            switch (opt)
404            {
405                    // 加法
406                case ADD:
407                    res = res + tmp;
408                    break;
409                    // 减法
410                case SUB:
411                    res = res - tmp;
412                    break;
413                    // 乘法
414                case MUL:
415                    res = res * tmp;
416                    break;
417                    // 除法
418                case DIV:
419                    res = res / tmp;
420                    break;
421                    // 平方
422                case SQR:
423                    res = tmp * tmp;
424                    break;
425                    // 平方根
426                case SQRT:
427                    res = System.Math.Sqrt(tmp);
428                    break;
429                default:
430                    return;
431            }
432            txtShow.Text = res.ToString();
433            opt = NULL;
434            res = 0;
435            num = 0;
436        }
437
438        private void btn_div_Click(object sender, System.EventArgs e)
439        {
440            // 除法运算
441            opt = DIV;
442            if (num != 0)
443            {
444                if (tmp != 0)
445                    res = res / tmp;
446            }
447            else
448                res = tmp;
449            num++;
450            tmp = 0;
451            txtShow.Text = res.ToString();
452        }
453
454        private void btn_mul_Click(object sender, System.EventArgs e)
455        {
456            // 乘法运算
457            opt = MUL;
458            if (num != 0)
459                res = res * tmp;
460            else
461                res = tmp;
462            num++;
463            tmp = 0;
464            txtShow.Text = res.ToString();
465        }
466
467        private void btn_sub_Click(object sender, System.EventArgs e)
468        {
469            // 减法运算
470            opt = SUB;
471            if (num != 0)
472                res = res - tmp;
473            else
474                res = tmp;
475            num++;
476            tmp = 0;
477            txtShow.Text = res.ToString();
478        }
479
480        private void btn_add_Click(object sender, System.EventArgs e)
481        {
482            // 加法运算
483            opt = ADD;
484            if (num != 0)
485                res = res + tmp;
486            else
487                res = tmp;
488            num++;
489            tmp = 0;
490            txtShow.Text = res.ToString();
491        }
492
493        private void btn_sqrt_Click(object sender, System.EventArgs e)
494        {
495            // 开方运算
496            if (tmp > 0)
497            {
498                tmp = Math.Sqrt(tmp);
499                txtShow.Text = tmp.ToString();
500            }
501        }
502
503        private void btn_sqr_Click(object sender, System.EventArgs e)
504        {
505            // 平方运算
506            tmp = tmp * tmp;
507            txtShow.Text = tmp.ToString();
508        }
509
510        private void btn_rev_Click(object sender, System.EventArgs e)
511        {
512            // 求倒数运算
513            tmp = 1 / tmp;
514            txtShow.Text = tmp.ToString();
515        }
516
517        private void btn_dot_Click(object sender, System.EventArgs e)
518        {
519            // 点击了小数点
520            dot = HASDOT;
521            dotnum = 0;
522        }
523
524        private void btn_sign_Click(object sender, System.EventArgs e)
525        {
526            // 点击了符号运算
527            tmp = -tmp;
528            txtShow.Text = tmp.ToString();
529        }
530    }
531}
532