c#简易计算器设计

c#简易计算器设计，这是我学习时的练习作品，能够完成简单的运算，但设计还有很多不周的地方，仅供参考。

源代码：

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 jisuanqi

{

public partial class Form1 : Form

{

double numA, numB, result;//numA数A，numB数B，result结果

bool flag;//判断是否为小小数

string myOperator;//操作类型

string historytxt;//记录原有的操作数

/// <summary>

/// NumberClick类

/// </summary>

public void NumberClick(int myNumber)

{

if (flag)

{

textBox1.Text = textBox1.Text + myNumber;

historytxt = historytxt + myNumber;

}

else

{

if (historytxt == "")

{

//输入的是整数的第一个数字

textBox1.Text =textBox1 .Text + myNumber + "";

historytxt = myNumber + "";

}

else

{

//输入的不是整数的第一个数字

textBox1.Text = textBox1.Text.Substring

(0, textBox1.Text.Length) + myNumber + "";

historytxt = historytxt.Substring(0, historytxt.Length) + myNumber + "";

}

}

}

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

historytxt = "";

textBox1.Text = "";

//指定文本框的对齐方式为右对齐

textBox1.TextAlign = HorizontalAlignment.Right;

}

private void button0_Click(object sender, EventArgs e)

{

NumberClick(0);

}

private void button1_Click(object sender, EventArgs e)

{

NumberClick(1);

}

private void button2_Click(object sender, EventArgs e)

{

NumberClick(2);

}

private void button3_Click(object sender, EventArgs e)

{

NumberClick(3);

}

private void button4_Click(object sender, EventArgs e)

{

NumberClick(4);

}

private void button5_Click(object sender, EventArgs e)

{

NumberClick(5);

}

private void button6_Click(object sender, EventArgs e)

{

NumberClick(6);

}

private void button7_Click(object sender, EventArgs e)

{

NumberClick(7);

}

private void button8_Click(object sender, EventArgs e)

{

NumberClick(8);

}

private void button9_Click(object sender, EventArgs e)

{

NumberClick(9);

}

private void bDot_Click(object sender, EventArgs e)

{

flag = true;//输入小数点

textBox1.Text = textBox1.Text + ".";

historytxt = historytxt + ".";

}

private void bCle_Click(object sender, EventArgs e)

{

numA = 0;

numB = 0;

textBox1.Text = "";

historytxt = "";

flag = false;

}

private void bPlus_Click(object sender, EventArgs e)

{

myOperator = "add";

numA = double.Parse(historytxt);

historytxt = "";

textBox1.Text = textBox1.Text + "+";

flag = false;

}

private void bSub_Click(object sender, EventArgs e)

{

myOperator = "Sub";

numA = double.Parse(historytxt);

textBox1.Text= textBox1.Text + "-";

historytxt ="";

flag = false;

}

private void bMul_Click(object sender, EventArgs e)

{

myOperator = "Mul";

numA = double.Parse(historytxt);

textBox1.Text = textBox1.Text + "*";

historytxt ="";

flag = false;

}

private void bDiv_Click(object sender, EventArgs e)

{

myOperator = "Div";

numA = double.Parse(historytxt);

textBox1.Text = textBox1.Text + "/";

historytxt = "";

flag = false;

}

private void bEqu_Click(object sender, EventArgs e)

{

numB = double.Parse(historytxt);

switch (myOperator)

{

case "add":

result = numA + numB;

textBox1.Text = textBox1.Text +"="+ result.ToString();

break;

case "Sub":

result = numA - numB;

textBox1.Text =textBox1.Text +"="+ result.ToString();

break;

case "Mul":

result = numA * numB ;

textBox1.Text =textBox1.Text +"="+ result.ToString();

break;

case "Div":

if (numB == 0)

{

textBox1.Text = "除数不能为零！";

}

else

{

result = numA / numB;

textBox1.Text =textBox1 .Text +"="+ result.ToString();

}

break;

}

// numA = result;

historytxt = result.ToString();

}

}

}