在经过一段时间的C#学习后，试着做了一个计算器的小工程。
计算器的界面如上图，包含基本的+、-、*、/运算以及1/x运算和清零功能。代码如下：
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 calcDemo_2_ 12 { 13 public partial class Form1 : Form 14 { 15 public Form1() 16 { 17 InitializeComponent(); 18 } 19 double step1, step2, step3; 20 string str;//定义运算符 21 int i = 0; 22 string numberStr = "";//两个以上的数字拼接 23 private void button0_Click(object sender, EventArgs e)//按钮0 24 { 25 if (double.Parse(textBox1.Text) > 0) 26 { 27 28 numberStr = numberStr + "0"; 29 textBox1.Text = numberStr; 30 } 31 else if (textBox1.Text == "0.") 32 { 33 numberStr = numberStr + "0"; 34 textBox1.Text = numberStr; 35 } 36 else 37 { 38 textBox1.Text = "0"; 39 numberStr = ""; 40 } 41 } 42 private void button1_Click(object sender, EventArgs e)//按钮1 43 { 44 numberStr += "1"; 45 textBox1.Text = numberStr; 46 } 47 private void button2_Click(object sender, EventArgs e)//按钮2 48 { 49 numberStr = numberStr + "2"; 50 textBox1.Text = numberStr; 51 } 52 private void button3_Click(object sender, EventArgs e)//按钮3 53 { 54 numberStr = numberStr + "3"; 55 textBox1.Text = numberStr; 56 } 57 private void button4_Click(object sender, EventArgs e)//按钮4 58 { 59 numberStr = numberStr + "4"; 60 textBox1.Text = numberStr; 61 } 62 63 private void button5_Click(object sender, EventArgs e)//按钮5 64 { 65 numberStr = numberStr + "5"; 66 textBox1.Text = numberStr; 67 } 68 69 private void button6_Click(object sender, EventArgs e)//按钮6 70 { 71 numberStr = numberStr + "6"; 72 textBox1.Text = numberStr; 73 } 74 75 private void button7_Click(object sender, EventArgs e)//按钮7 76 { 77 numberStr = numberStr + "7"; 78 textBox1.Text = numberStr; 79 } 80 81 private void button8_Click(object sender, EventArgs e)//按钮8 82 { 83 numberStr = numberStr + "8"; 84 textBox1.Text = numberStr; 85 } 86 87 private void button9_Click(object sender, EventArgs e)//按钮9 88 { 89 numberStr = numberStr + "9"; 90 textBox1.Text = numberStr; 91 } 92 private void buttonPoint_Click(object sender, EventArgs e)//小数点 93 { 94 i = i + 1; 95 if (i == 1 && textBox1.Text.Length != 0) 96 { 97 numberStr = textBox1.Text.ToString(); 98 numberStr += "."; 99 } 100 textBox1.Text = numberStr; 101 } 102 private void buttonadd_Click(object sender, EventArgs e)//加法代码 103 { 104 str = "+"; 105 if (textBox1.Text.Length != 0) 106 { 107 step1 = double.Parse(textBox1.Text); 108 } 109 else 110 { 111 step1 = 0; 112 } 113 textBox1.Text = "0"; 114 numberStr = ""; 115 i = 0;//按下＋号键后获取第一个数step1； 116 } 117 118 private void buttonsub_Click(object sender, EventArgs e)//减法代码 119 { 120 str = "-"; 121 if (textBox1.Text.Length != 0) 122 { 123 step1 = double.Parse(textBox1.Text); 124 } 125 else 126 { 127 step1 = 0; 128 } 129 textBox1.Text = "0"; 130 numberStr = ""; 131 i = 0;//按下-号键后获取第一个数step1； 132 } 133 134 private void buttonmul_Click(object sender, EventArgs e)//乘法代码 135 { 136 str = "*"; 137 if (textBox1.Text.Length != 0) 138 { 139 step1 = double.Parse(textBox1.Text); 140 } 141 else 142 { 143 step1 = 0; 144 } 145 textBox1.Text = "0"; 146 numberStr = ""; 147 i = 0;//按下*号键后获取第一个数step1； 148 } 149 150 private void buttondiv_Click(object sender, EventArgs e)//除法代码 151 { 152 str = "/"; 153 if (textBox1.Text.Length != 0) 154 { 155 step1 = double.Parse(textBox1.Text); 156 } 157 else 158 { 159 step1 = 0; 160 } 161 textBox1.Text = "0"; 162 numberStr = ""; 163 i = 0;//按下/号键后获取第一个数step1； 164 } 165 /// <summary> 166 /// 设计一个方法，将获得的两个数和一个运算符执行+，-，*，/ 167 /// </summary> 168 /// <param name="num1">第一个数</param> 169 /// <param name="num2">第二个数</param> 170 /// <param name="str1">运算符</param> 171 /// <returns>经过运算返回*+、-、/、*的结果</returns> 172 private double NumberFunction(double num1, double num2, string str1) 173 { 174 double result = 0; 175 switch (str1) 176 { 177 case "+": 178 result = num1 + num2; 179 break; 180 case "-": 181 result = num1 - num2; 182 break; 183 case "*": 184 result = num1 * num2; 185 break; 186 case "/": 187 if (step2 != 0) 188 { 189 result = num1 / num2; 190 } 191 break; 192 } 193 return result; 194 } 195 196 private void buttonresult_Click(object sender, EventArgs e)//按钮= 197 { 198 step2 = double.Parse(textBox1.Text);//按下后获取第二个数step2 199 if (str != null) 200 { 201 textBox1.Text = NumberFunction(step1, step2, str).ToString(); 202 } 203 else 204 { 205 textBox1.Text = step2.ToString(); 206 }//将step1、step2及str带入方法NumberFunction进行计算，并将结果显示到文本框； 207 numberStr = ""; 208 i = 0; 209 } 210 211 private void textBox1_TextChanged(object sender, EventArgs e) 212 { 213 214 } 215 216 private void buttonclear_Click(object sender, EventArgs e)//按钮C，重置所有数值 217 { 218 textBox1.Text = "0"; 219 numberStr = ""; 220 i = 0; 221 step1 = 0; 222 step2 = 0; 223 step3 = 0; 224 } 225 226 private void buttondivx_Click(object sender, EventArgs e)//按钮1/x，输入一个数，得出1除以该数的值 227 { 228 if (textBox1.Text.Length != 0) 229 { 230 step3 = double.Parse(textBox1.Text); 231 } 232 else 233 { 234 step3 = 0; 235 } 236 if (step3 != 0) 237 { 238 textBox1.Text = (1 / step3).ToString(); 239 } 240 else 241 { 242 textBox1.Text = "error"; 243 } 244 numberStr = ""; 245 } 246 247 248 } 249 }
经过多次运行，解决了诸多bug，例如第一个数为0的拼接问题、小数点的问题、0.0的问题，相信其中应该还存在着bug，若有朋友看到，敬请评论指点。C#新手，没什么高质量，高手勿笑。