1.打開Microsoft Visual Studio 2013, 新建名字為【Calculator】的項目。
2.在Form1窗體上放置合適的控件，進行布局，(PS:建議遵循好的命名規范)。
3.Form1的代碼書寫如下：
1 public partial class frmMain : Form
2 {
3 private string number;
4 public frmMain()
5 {
6 InitializeComponent();
7 }
8 /// <summary>
9 /// 將計算器可輸入字符1~9，+，-，*，/，(，)同時賦值給變量number和文本框txtDisplay
10 /// </summary>
11 /// <param name="sender"></param>
12 /// <param name="e"></param>
13 private void InputHandler(object sender, EventArgs e)
14 {
15 number += ((Button)sender).Text;
16 this.txtDisplay.Text += ((Button)sender).Text;
17 }
18 /// <summary>
19 /// =
20 /// </summary>
21 /// <param name="sender"></param>
22 /// <param name="e"></param>
23 private void btnQual_Click(object sender, EventArgs e)
24 {
25 //如果txtDisplay文本框不為空，則進行計算
26 if (txtDisplay.Text != String.Empty)
27 {
28 number = this.txtDisplay.Text;
29 this.txtDisplay.Text += "=";
30 this.txtDisplay.Text += Calculator.dealWith(number).ToString();
31 }
32 }
33 /// <summary>
34 /// CE
35 /// </summary>
36 /// <param name="sender"></param>
37 /// <param name="e"></param>
38 private void btClear_Click(object sender, EventArgs e)
39 {
40 number = string.Empty;
41 txtDisplay.Text = string.Empty;
42 }
43 /// <summary>
44 /// 限制txtDisplay中的字符輸入
45 /// </summary>
46 /// <param name="sender"></param>
47 /// <param name="e"></param>
48 private void txtDisplay_KeyPress(object sender, KeyPressEventArgs e)
49 {
50 //如果輸入的不是數字類別，也不是回車鍵、Backspace鍵、+ - * / ( )，則txtDisplay_KeyPress取消該輸入
51 if (!(Char.IsNumber(e.KeyChar)) && e.KeyChar != (char)13 && e.KeyChar != (char)8 && e.KeyChar != (char)40 && e.KeyChar != (char)41 && e.KeyChar != (char)42 && e.KeyChar != (char)43 && e.KeyChar != (char)45 && e.KeyChar != (char)47)
52 {
53 e.Handled = true;
54 }
55 }
56 }
4.我們注意到 btnQual_Click事件中有一個方法Calculator.dealWith()，同樣我們將Calculator代碼書寫如下：
1 public static class Calculator
2 {
3 public static float dealWith(string number)
4 {
5 string operand1="", opreand2="";
6 float result = 0;
7 char opera = ' ', operandOrOera = ' ';
8 string[,] opreandArray = new string[50, 2];
9 Queue numberQueue = new Queue();
10
11 //循環字符串中的所有字符並賦值給numberQueue隊列
12 foreach (char c in number)
13 {
14
15 numberQueue.Enqueue(c);
16 }
17
18 //拆分隊列中的字符，構成一個數字與“+”或“-”的組合，然後逐個放入二維數組opreandArray中
19 while (numberQueue.Count != 0)
20 {
21 operandOrOera = Convert.ToChar(numberQueue.Peek());
22 if (operandOrOera == '(')
23 {
24 numberQueue.Dequeue();
25 string inside = null;
26 while (Convert.ToChar(numberQueue.Peek()) != ')')
27 {
28 inside += (numberQueue.Dequeue()).ToString();
29 }
30 numberQueue.Dequeue();
31 operand1 = dealWith(inside).ToString();
32 }
33 while (Convert.ToInt32(operandOrOera) > 47 && Convert.ToInt32(operandOrOera) < 58)//ASCII48-57對應0-9
34 {
35 numberQueue.Dequeue();
36 operand1 += operandOrOera.ToString();
37 if (numberQueue.Count != 0)
38 {
39 operandOrOera = Convert.ToChar(numberQueue.Peek());
40 }
41 else
42 {
43 break;
44 }
45 }
46 int j = 0;
47 if (operandOrOera == '+' || operandOrOera == '-' || operandOrOera == '*' || operandOrOera == '/')
48 {
49 numberQueue.Dequeue();
50 opera = operandOrOera;
51 //如果是"+"或"-"
52 if (opera == '+' || opera == '-')
53 {
54 opreandArray[j, 0] = operand1;
55 opreandArray[j, 1] = opera.ToString();
56 j++;
57 operand1 = null;
58 }
59 //如果是"*"或"/"
60 else
61 {
62 char n = Convert.ToChar(numberQueue.Peek());
63 if (n == '(')
64 {
65
66 numberQueue.Dequeue();
67 string inside = null;
68 while (Convert.ToChar(numberQueue.Peek()) != ')')
69 {
70 inside += (numberQueue.Dequeue()).ToString();
71 }
72 numberQueue.Dequeue();
73 opreand2 = dealWith(inside).ToString();
74 }
75 while (Convert.ToInt32(n) > 47 && Convert.ToInt32(n) < 58)
76 {
77 opreand2 += n.ToString();
78 numberQueue.Dequeue();
79 if (numberQueue.Count != 0)
80 {
81 n = Convert.ToChar(numberQueue.Peek());
82 }
83 else
84 {
85 break;
86 }
87 }
88
89 switch (opera)
90 {
91 case ('*'):
92 {
93 operand1 = (Convert.ToInt32(operand1) * Convert.ToInt32(opreand2)).ToString();
94 break;
95 }
96 case ('/'):
97 {
98 try
99 {
100 operand1 = (Convert.ToInt32(operand1) / Convert.ToInt32(opreand2)).ToString();
101 }
102 catch(Exception) {
103
104 }
105 break;
106 }
107
108 }
109 opreand2 = null;
110 }
111 }
112 }
113
114
115 //把二維數組中的數計算，賦值result
116 int count = 0;
117 for (int i = 0; opreandArray[i, 0] != null; i++)
118 {
119 count++;
120 }
121 for (int i = 0; i < count; i++)
122 {
123 if (i == 0)
124 {
125 result += Convert.ToInt32(opreandArray[i, 0]);
126
127 }
128 else
129 {
130 if (opreandArray[i - 1, 1] == "+")
131 {
132 result += Convert.ToInt32(opreandArray[i, 0]);
133 }
134 else
135 {
136 result -= Convert.ToInt32(opreandArray[i, 0]);
137 }
138 }
139 }
140
141
142
143 //最後把沒有放進數組中的加上或者減掉
144 if (count != 0)
145 {
146 if (opreandArray[count - 1, 1] == "+")
147 {
148 return result + Convert.ToInt32(operand1);
149 }
150 else
151 {
152 return result - Convert.ToInt32(operand1);
153 }
154 }
155 else
156 {
157 return Convert.ToInt32(operand1);
158 }
159 }
160 }
5.O(∩_∩)O哈哈~，基本的代碼書寫我們就完成啦。
