C#编写的计算器算法

using System Configuration using System Web using System Web Security using System Web UI using System Web UI WebControls using System Web UI WebControls WebParts using System Web UI HtmlControls public partial class 计算器 System Web UI Page static double num1 num2 sum 0 定义变量 protected void Page Load object sender EventArgs e if IsPostBack string ThemeName txtSum Text 先给计算器赋一个初始值为空 ThemeName Request QueryString themeName switch ThemeName 选择主题 case MyThemes1 RadioButton1 Checked true break case MyThemes2 RadioButton2 Checked true break case MyThemes3 RadioButton3 Checked true break default RadioButton1 Checked true break 第一次加载网页时 单击数字键 protected void btn0 Click object sender EventArgs e if txtSum Text 0 txtSum Text 0 else txtSum Text 0 protected void btn1 Click object sender EventArgs e if txtSum Text 0 txtSum Text 1 else txtSum Text 1 protected void btn2 Click object sender EventArgs e if txtSum Text 0 txtSum Text 2 else txtSum Text 2 protected void btn3 Click object sender EventArgs e if txtSum Text 0 txtSum Text 3 else txtSum Text 3 protected void btn4 Click object sender EventArgs e if txtSum Text 0 txtSum Text 4 else txtSum Text 4 protected void btn5 Click object sender EventArgs e if txtSum Text 0 txtSum Text 5 else txtSum Text 5 protected void btn6 Click object sender EventArgs e if txtSum Text 0 txtSum Text 6 else txtSum Text 6 protected void btn7 Click object sender EventArgs e if txtSum Text 0 txtSum Text 7 else txtSum Text 7 protected void btn8 Click object sender EventArgs e if txtSum Text 0 txtSum Text 8 else txtSum Text 8 protected void btn9 Click object sender EventArgs e if txtSum Text 0 txtSum Text 9 else txtSum Text 9 protected void btnDot Click object sender EventArgs e if txtSum Text txtSum Text 加 减 乘 除 取余算法 protected void btnAdd Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text txtSum Text string symbols Session Symbols symbols protected void btnSub Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text txtSum Text string symbols Session Symbols symbols protected void btnMul Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text txtSum Text string symbols Session Symbols symbols protected void btnDiv Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text txtSum Text string symbols Session Symbols symbols protected void btnQy Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text txtSum Text string symbols Session Symbols symbols 清空 protected void btnC Click object sender EventArgs e txtSum Text txtSum1 Text 等号的激发事件 protected void btnDy Click object sender EventArgs e string symbols string Session Symbols switch symbols case txtSum1 Text txtSum1 Text txtSum Text num2 Convert ToDouble txtSum Text txtSum Text num1 num2 ToString break case txtSum1 Text txtSum1 Text txtSum Text num2 Convert ToDouble txtSum Text txtSum Text num1 num2 ToString break case txtSum1 Text txtSum1 Text txtSum Text num2 Convert ToDouble txtSum Text txtSum Text num1 num2 ToString break case txtSum1 Text txtSum1 Text txtSum Text num2 Convert ToDouble txtSum Text if num2 0 txtSum Text 除数不能为0 else txtSum Text num1 num2 ToString break case txtSum1 Text txtSum1 Text txtSum Text num2 Convert ToDouble txtSum Text if num2 0 txtSum Text 除数不能为0 else txtSum Text num1 num2 ToString break 求倒 protected void btnQf Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text if num1 0 num1 1 num1 txtSum Text num1 ToString else txtSum Text 除数不能为零 开方 protected void btnSquart Click object sender EventArgs e txtSum1 Text txtSum Text num1 Convert ToDouble txtSum Text if num1 0 num1 Math Sqrt num1 txtSum Text num1 ToString else txtSum Text 负数不能开平方 累加 protected void btnMadd Click object sender EventArgs e sum Convert ToDouble txtSum Text sum txtSum1 Text sum ToString txtSum Text x的平方 protected void btnX2 Click object sender EventArgs e txtSum1 Text txtSum Text 的平方 sum Convert ToDouble txtSum Text Convert ToDouble txtSum Text txtSum Text sum ToString 正负切换 protected void btnZf Click object sender EventArgs e double storNum if txtSum Text Length 0 storNum double Parse txtSum Text storNum 1 txtSum Text storNum ToString 退格 protected void btnTg Click object sender EventArgs e if txtSum Text Length 0 txtSum Text txtSum Text Substring 0 txtSum Text Length 1 else txtSum Text 不能再退了 切换主题 void Page PreInit object sender EventArgs e string ThemeName ThemeName Request QueryString themeName this Theme ThemeName protected void btnSet Cli