winfrom实现简单计算器V2版本

前面，使用winform实现了个简单的计算器，今天，再来给大家看一个稍微复杂点的计算器，效果图如下：
在这里插入图片描述

包括归零，退格，加减乘除都已经实现，如果想要继续扩展的可以在稍微改改即可。
现在看看怎么实现的：
1.先从工具箱里面拉出来一个这样的窗体：

2.归零的方法：

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

3.退格的方法：

 //退格的按钮private void tuige_Click(object sender, EventArgs e){//判断当前能不能点击退格//判断显示框是否有值，有值的话可以删除，没有值的话提示不能删除if (this.lbljieguo.Text.Length > 0){char ch = 'a';      //保存符号//遍历字符串foreach (char c in sb.ToString()){ch = c;     //最后一个值放在ch里面}//判断最后一个是否是+-*/%if (ch != '+'){//如果是，不能动num1和num2,否则可以动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("显示框都没有值，你删啥？", "提示信息");}}

4.（1 2 3 4 5 6 7 8 9 0）的点击事件：

 //第一个数StringBuilder num1 = new StringBuilder();//第二个数StringBuilder num2 = new StringBuilder();//判断是否是第一次输入bool flag = false;//运算符string fu = "";//当计算完结果时，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.加减乘除的点击事件：

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：

 //等于的按钮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;     //显示的是结果}

整个的实现方法以及代码都已经给出，不做伸手党，自己动脑思考思考，加油啊，在编码路上的你们~~
在这里插入图片描述