入门，C#做出一个计算器怎么写

Question

先实现最简单的运算功能吧

Answer 1

拖几个文本框
不想麻烦就在各个文本框中间加个Lable写运算符想好点
给个选择
大不了是下拉框，选择运算符
加减乘除
注意做些验证，提高体验
以及字符的转换！

Answer 2

到这里面去下载。有源码的
http://download.csdn.net/source/1919661

Answer 3

private void button4_Click(object sender, System.EventArgs e)
{
          double d=0;
switch(c)
{
case "+":d=this.a+Convert.ToDouble(this.textBox1.Text);
break;
case "-":d=this.a-Convert.ToDouble(this.textBox1.Text);
break;
case "*":d=this.a*Convert.ToDouble(this.textBox1.Text);
break;
case "/":d=this.a/Convert.ToDouble(this.textBox1.Text);
break;

}
this.textBox1.Text=d.ToString();
} double a=0;
string c=""; private void button12_Click(object sender, System.EventArgs e)
{
  
this.a=double.Parse(this.textBox1.Text);
this.c=this.ActiveControl.Text;
            this.textBox1.Text="";
} private void button8_Click(object sender, System.EventArgs e)
{
this.textBox1.Text=this.textBox1.Text.Substring(0,this.textBox1.Text.Length-1);
} private void button9_Click(object sender, System.EventArgs e)
{
this.textBox1.Text="";
}

Answer 4

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; namespace WindowsCalculator 
{ 
    public partial class Form1 : Form 
    { 
        //构造器 
        public Form1() 
        { 
            InitializeComponent(); 
            this.initializeValues(); 
        }         //定义缓存变量 
        public int resultValue; 
        public int currentValue; 
        private Operation cachedOperation;         // 做初始化工作 
        public void initializeValues() 
        { 
            this.resultValue = 0; 
            this.currentValue = 0; 
            this.cachedOperation = Operation.None; 
        }         // 显示当前正在输入的值 
        public void DisplayCurrentValue() 
        { 
            this.textBox1.Text = this.currentValue.ToString(); 
        } 
        // 显示已有结果 
        public void DisplayResultValue() 
        { 
            this.textBox1.Text = this.resultValue.ToString(); 
        }         // 数字键点击事件处理器 
        private void NumberButton_Click(object sender, EventArgs e) 
        { 
            Button btn = sender as Button; 
            if (!btn.Text.ToString().Equals(".")) 
            { 
                this.currentValue = this.currentValue * 10 + int.Parse(btn.Text); 
            } 
            else 
            { 
                this.currentValue = this.currentValue + int.Parse(btn.Text.ToString()); 
            }       
            this.DisplayCurrentValue(); 
        }         //操作符 
        private void OperatorButton_Click(object sender, EventArgs e) 
        { 
            this.CalculateCore(); 
            if (sender == buttonAdd) 
            { 
                this.cachedOperation = Operation.Add; 
            } 
            if (sender == buttonSub) 
            { 
                this.cachedOperation = Operation.Sub; 
            } 
            if (sender == buttonMul) 
            { 
                this.cachedOperation = Operation.Mul; 
            } 
            if (sender == buttonDiv) 
            { 
                this.cachedOperation = Operation.Div; 
            } 
        }         //result 
        private void buttonResult_Click(object sender, EventArgs e) 
        { 
            CalculateCore(); 
        }         // 运算核心 
        private void CalculateCore() 
        { 
            switch (this.cachedOperation) 
            { 
                case Operation.Add: 
                    this.resultValue += this.currentValue; 
                    break; 
                case Operation.Sub: 
                    this.resultValue -= this.currentValue; 
                    break; 
                case Operation.Mul: 
                    this.resultValue *= this.currentValue; 
                    break; 
                case Operation.Div: 
                    if (this.currentValue != 0) 
                    { 
                        this.resultValue /= this.currentValue; 
                    } 
                    else 
                    { 
                        MessageBox.Show("Zero Error!"); 
                    } 
                    break; 
                case Operation.None: 
                default: 
                    this.resultValue = this.currentValue; 
                    break; 
            } 
            this.currentValue = 0; 
            this.DisplayResultValue(); 
        }         // 运算类型 
        enum Operation 
        { 
            Add, 
            Sub, 
            Mul, 
            Div, 
            None 
        }         private void buttonClear_Click(object sender, EventArgs e) 
        { 
            this.initializeValues(); 
            this.DisplayResultValue(); 
        } 
    } 
}