前面，使用winform實現了個簡單的計算器，今天，再來給大家看一個稍微復雜點的計算器，效果圖如下：


包括歸零，退格，加減乘除都已經實現，如果想要繼續擴展的可以在稍微改改即可。
現在看看怎么實現的：
1.先從工具箱里面拉出來一個這樣的窗體：

2.歸零的方法：

private void qingchu_Click(object sender, EventArgs e){this.lbljieguo.Text = "0";sb = new StringBuilder("");}

3.退格的方法：

//退格的按鈕private void tuige_Click(object sender, EventArgs e){//判斷當前能不能點擊退格//判斷顯示框是否有值，有值的話可以刪除，沒有值的話提示不能刪除if (this.lbljieguo.Text.Length > 0){char ch = 'a'; //保存符號//遍歷字符串foreach (char c in sb.ToString()){ch = c; //最后一個值放在ch里面}//判斷最后一個是否是+-*/%if (ch != '+'){//如果是，不能動num1和num2,否則可以動if (flag == false){num1 = new StringBuilder(num1.ToString().Substring(0, num1.Length - 1));}else{num2 = new StringBuilder(num2.ToString().Substring(0, num2.Length - 1));}}ji = false;this.lbljieguo.Text = sb.ToString().Substring(0, this.lbljieguo.Text.Length - 1);sb = new StringBuilder(this.lbljieguo.Text);}else{MessageBox.Show("顯示框都沒有值，你刪啥？", "提示信息");}}

4.（1 2 3 4 5 6 7 8 9 0）的點擊事件：

//第一個數StringBuilder num1 = new StringBuilder();//第二個數StringBuilder num2 = new StringBuilder();//判斷是否是第一次輸入bool flag = false;//運算符string fu = "";//當計算完結果時，不能退格bool ji = false;StringBuilder sb = new StringBuilder();//7private void btn7_Click(object sender, EventArgs e){if (flag == false){num1.Append(7);}else{num2.Append(7);}sb.Append(7);this.lbljieguo.Text = sb.ToString();}//8private void btn8_Click(object sender, EventArgs e){if (flag == false){num1.Append(8);}else{num2.Append(8);}sb.Append(8);this.lbljieguo.Text = sb.ToString();}private void btn9_Click(object sender, EventArgs e){if (flag == false){num1.Append(9);}else{num2.Append(9);}sb.Append(9);this.lbljieguo.Text = sb.ToString();}private void btn4_Click(object sender, EventArgs e){if (flag == false){num1.Append(4);}else{num2.Append(4);}sb.Append(4);this.lbljieguo.Text = sb.ToString();}private void btn5_Click(object sender, EventArgs e){if (flag == false){num1.Append(5);}else{num2.Append(5);}sb.Append(5);this.lbljieguo.Text = sb.ToString();}private void btn6_Click(object sender, EventArgs e){if (flag == false){num1.Append(6);}else{num2.Append(6);}sb.Append(6);this.lbljieguo.Text = sb.ToString();}private void btn1_Click(object sender, EventArgs e){if (flag == false){num1.Append(1);}else{num2.Append(1);}sb.Append(1);this.lbljieguo.Text = sb.ToString();}private void btn2_Click(object sender, EventArgs e){if (flag == false){num1.Append(2);}else{num2.Append(2);}sb.Append(2);this.lbljieguo.Text = sb.ToString();}private void btn3_Click(object sender, EventArgs e){if (flag == false){num1.Append(3);}else{num2.Append(3);}sb.Append(3);this.lbljieguo.Text = sb.ToString();}private void btn0_Click(object sender, EventArgs e){if (flag == false){num1.Append(0);}else{num2.Append(0);}sb.Append(0);this.lbljieguo.Text = sb.ToString();}

5.加減乘除的點擊事件：

private void btnchu_Click(object sender, EventArgs e){flag = true;sb.Append("/");this.lbljieguo.Text = sb.ToString();fu = "/";}private void btnyu_Click(object sender, EventArgs e){flag = true;sb.Append("%");this.lbljieguo.Text = sb.ToString();fu = "%";}private void btnjia_Click(object sender, EventArgs e){flag = true;sb.Append("+");this.lbljieguo.Text = sb.ToString();fu = "+";}private void btnjian_Click(object sender, EventArgs e){flag = true;sb.Append("-");this.lbljieguo.Text = sb.ToString();fu = "-";}private void btncheng_Click(object sender, EventArgs e){flag = true;sb.Append("*");this.lbljieguo.Text = sb.ToString();fu = "*";}

6.等于的方法：

//等于的按鈕private void btndeng_Click(object sender, EventArgs e){//string xianshi = sb.ToString();switch (fu){case "+":this.lbljieguo.Text = (int.Parse(num1.ToString()) + int.Parse(num2.ToString())).ToString();break;case "-":this.lbljieguo.Text = (int.Parse(num1.ToString()) - int.Parse(num2.ToString())).ToString();break;case "*":this.lbljieguo.Text = (int.Parse(num1.ToString()) * int.Parse(num2.ToString())).ToString();break;case "/":this.lbljieguo.Text = (int.Parse(num1.ToString()) / int.Parse(num2.ToString())).ToString();break;case "%":this.lbljieguo.Text = (int.Parse(num1.ToString()) % int.Parse(num2.ToString())).ToString();break;}num1 = new StringBuilder("");num2 = new StringBuilder("");sb = new StringBuilder("");flag = false;ji = true; //顯示的是結果}

整個的實現方法以及代碼都已經給出，不做伸手黨，自己動腦思考思考，加油啊，在編碼路上的你們~~

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