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简单版计算器，加减乘除功能。

具体怎么做出来的呢，嗯，我先说一说布局。显示框用两个label控件，label1显示操作运算，label2显示运算值。设置其AutoSize属性为false，就可以把label控件延伸扩大了。

操作运算符和数字都是button控件，外观设置就不说了，最基础的，小白不会的就去查资料。

然后现在就说一下操作

代码了，添加一个操作运算基类Oper

public class Oper{private double _numberA = 0;private double _numberB = 0;public double NumberA{get { return _numberA; }set { _numberA = value; }}public double NumnberB{get { return _numberB; }set { _numberB = value; }}public virtual double GetResult(){double result = 0d;return result;}}

 

 

添加四个加减乘除类继承Oper类，

 //加法类
public class OperAdd : Oper    {/// <summary>/// 重写父方法:GetResult/// </summary>/// <returns></returns>public override double GetResult(){double result = 0;result = NumberA + NumnberB;return result;}}//减法类public class OperSub : Oper    {public override double GetResult(){double result = 0;result = NumberA - NumnberB;return result;}}//乘法类
public class OperMul : Oper    {public override double GetResult(){double result = 0;result = NumberA * NumnberB;return result;}}//除法类
public class OperationDiv : Oper    {public override double GetResult(){double result = 0;if (NumnberB == 0)throw new Exception("除数不能为0.");result = NumberA * 1.0 / NumnberB;return result;}}

　　

 

再添加个运算工厂类OperFactory作为中转站，输入运算符，工厂就能实例化出合适的对象，通过多态，返回父类的方式实现计算器的结果。

public class OperFactory{/// <summary>/// 只需输入运算符，工厂就能实例化出合适的对象，通过多态，返回父类的方式实现了计算器的结果/// </summary>/// <param name="operate">运算符</param>/// <returns></returns>public static Oper createOpeate(EnumOperator op){Oper oper = null;switch (op){case EnumOperator.Add:oper = new OperationAdd();break;case EnumOperator.Minus:oper = new OperationSub();break;case EnumOperator.Multiply:oper = new OperationMul();break;case EnumOperator.Divide:oper = new OperationDiv();break;default:break;}return oper;}}

首先按数字的时候，添加一个函数NumberClick

        double currentValue = 0;   //第1个数 double numSum = 0;  //第2个数private EnumOperator currentOperator; //当前操作符  /// <summary>/// 按数字的时候/// </summary>/// <param name="strNumber"></param>private void NumberClick(string strNumber){label1.Text = label1.Text + strNumber;currentValue = Convert.ToDouble(label1.Text);label2.Text += strNumber;}   

然后给每个数字按钮弄一个点击事件，调用数字函数。

private void button7_Click(object sender, EventArgs e){NumberClick(button7.Text);}

定义一个函数DisOperator，实现显示框中输入的数字和运算符

 private void DisplayOperator(EnumOperator op){switch (op){case EnumOperator.None:label2.Text = label1.Text;label2.Text += "";break;case EnumOperator.Add:if (label1.Text != ""){label2.Text = label1.Text;}label2.Text += "+";break;case EnumOperator.Minus:if (label1.Text != ""){label2.Text = label1.Text;}label2.Text += "-";break;case EnumOperator.Multiply:label2.Text = label1.Text;label2.Text += "x";break;case EnumOperator.Divide:label2.Text = label1.Text;label2.Text += "➗";break;default:break;}}

根据运算符和两个数字的计算结果

调用简单工厂模式生成的类

Evaluate

private void Evaluate(){Oper oper;//根据不同的对象生成不同的类，多态!switch (currentOperator){case EnumOperator.None:break;case EnumOperator.Add:oper = OperationFactory.createOpeate(EnumOperator.Add);oper.NumberA = numSum;oper.NumnberB = currentValue;numSum = oper.GetResult();break;case EnumOperator.Minus:oper = OperationFactory.createOpeate(EnumOperator.Minus);oper.NumberA = numSum;oper.NumnberB = currentValue;numSum = oper.GetResult();break;case EnumOperator.Multiply:oper = OperationFactory.createOpeate(EnumOperator.Multiply);oper.NumberA = numSum;oper.NumnberB = currentValue;numSum = oper.GetResult();break;case EnumOperator.Divide:if (currentValue != 0){oper = OperationFactory.createOpeate(EnumOperator.Divide);oper.NumberA = numSum;oper.NumnberB = currentValue;numSum = oper.GetResult();}else{MessageBox.Show("除数不能为0哦，亲~", "出错了~");}break;}currentValue = 0;currentOperator = EnumOperator.None;}

再定义一个函数OperatorClick，调用DisOperator函数和Evaluate函数

private void OperatorClick(EnumOperator op){if (currentOperator != EnumOperator.None){//计算
                Evaluate();}else{//numSum = double.Parse(lblResult.Text);double.TryParse(label1.Text, out numSum);}DisplayOperator(op);label1.Text = "";currentOperator = op;}

在加减乘除按钮上双击，进入后台，调用OperatorClick()函数

        private void button12_Click(object sender, EventArgs e){OperatorClick(EnumOperator.Add);}private void button13_Click(object sender, EventArgs e){OperatorClick(EnumOperator.Minus);}private void button14_Click(object sender, EventArgs e){OperatorClick(EnumOperator.Multiply);}private void button15_Click(object sender, EventArgs e){OperatorClick(EnumOperator.Divide);}

在=按钮上双击，进入后台，编辑

private void button10_Click(object sender, EventArgs e){Evaluate();label1.Text = numSum.ToString();//防止重复按 = if (label1.Text.Length > 1 && label1.Text.Substring(label1.Text.Length - 1) != "="){label1.Text += "=";}}

在C按钮上双击，进入后台编辑

private void button16_Click(object sender, EventArgs e){currentOperator = EnumOperator.None;label1.Text = "";label2.Text = "";numSum = 0;}

 

ok，这就是简单版计算器的全部讲解以及代码了。

根据一个大佬的源码改进的，编程语言勉强入门，有不足的地方请大佬们指点。