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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 WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

}

double sum = 0;//记录部分和

bool blnClear = false; //表示如果再输入数字或小数点，先清除编辑框中显示的前一个加数

string strOper = "+"; //记录输入的运算符

double dbSencond;//保存第二个数据

public void addNum(int num)//添加数字

{

textBox1.Text = textBox1.Text + num.ToString();

//如果显示框的第一个字符为0，而且第二个字符不是小数点，则自动去掉第一个字符‘0’

if(textBox1.Text.Substring(0,1)=="0"&&textBox1.Text.Substring(1,1)!=".")

{

textBox1.Text=textBox1.Text.Substring(1);

}

}

//0

private void button28_Click(object sender, EventArgs e)

{

if (blnClear) //如果为真，输入下一个加数前，先清除textBox1显示内容

{

textBox1.Text = "0";

blnClear = false;

}

Button b1 = (Button)sender;

if (textBox1.Text != "0") //如果前面已经输入非零数字，如：12

textBox1.Text += b1.Text; //此时键入0，应为120

else

textBox1.Text = b1.Text; //如已输入的数字为0，显示的数字应为0

//dbSencond = 0;

}

//1

private void button22_Click(object sender, EventArgs e)

{

if (blnClear)

{

textBox1.Text = "0";

blnClear = false;

}

Button b1 = (Button)sender;

if (textBox1.Text != "0")

textBox1.Text += b1.Text;

else

textBox1.Text = b1.Text;

//dbSencond = 1;

}

//除法

private void button14_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

if (!blnClear)

{

switch (strOper)

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

}

if (sender == button14)

{

strOper = "/";

}

if (sender == button27)

{

strOper = "=";

}

textBox1.Text = Convert.ToString(sum);

blnClear = true;

}

//乘法

private void button20_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

if (!blnClear)

{

switch (strOper)

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

}

if (sender == button20)

{

strOper = "*";

}

if (sender == button27)

{

strOper = "=";

}

textBox1.Text = Convert.ToString(sum);

blnClear = true;

}

//减法

private void button26_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

if (!blnClear)

switch (strOper)

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

textBox1.Text = Convert.ToString(sum);

blnClear = true;

}

//加法

private void button32_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

if (!blnClear) //如果未输入第二个操作符，不运算，例如连续输入+-*/或=

{

switch (strOper) //按上次记录的运算符号运算

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

}

textBox1.Text = Convert.ToString(sum); // 显示部分和

blnClear = true; // 设置标记使键入另一个加数前，先清除显示的前个加数

}

//等于

private void button27_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

if (!blnClear)

{

switch (strOper)

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

}

textBox1.Text = Convert.ToString(sum);

blnClear = true;

}

//清除当前显示数字

private void button4_Click(object sender, EventArgs e)

{

textBox1.Text = "0";//显示屏清空

sum = 0; //临时计算结果归零

blnClear = false;

strOper = "+";

}

//清除当前计算

private void button5_Click(object sender, EventArgs e)

{

textBox1.Text = "0";

sum = 0;

blnClear = false;

strOper = "+";

}

//小数点

private void button30_Click(object sender, EventArgs e)

{

if (blnClear)

{

textBox1.Text = "0";

blnClear = false;

}

int n = textBox1.Text.IndexOf(".");

if (n == -1) //如果没有小数点，增加小数点，否则不增加

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

}

//正负符号

private void button8_Click(object sender, EventArgs e)

{

double dbSencond = Convert.ToDouble(textBox1.Text);

textBox1.Text = Convert.ToString(-dbSencond);

}

//√

private void button9_Click(object sender, EventArgs e)

{

}

}

}