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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;//記錄部分和

bool blnClear = false; //表示如果再輸入數(shù)字或小數(shù)點(diǎn)，先清除編輯框中顯示的前一個加數(shù)

string strOper = "+"; //記錄輸入的運(yùn)算符

double dbSencond;//保存第二個數(shù)據(jù)

public void addNum(int num)//添加數(shù)字

{

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

//如果顯示框的第一個字符為0，而且第二個字符不是小數(shù)點(diǎn)，則自動去掉第一個字符‘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) //如果為真，輸入下一個加數(shù)前，先清除textBox1顯示內(nèi)容

{

textBox1.Text = "0";

blnClear = false;

}

Button b1 = (Button)sender;

if (textBox1.Text != "0") //如果前面已經(jīng)輸入非零數(shù)字，如：12

textBox1.Text += b1.Text; //此時(shí)鍵入0，應(yīng)為120

else

textBox1.Text = b1.Text; //如已輸入的數(shù)字為0，顯示的數(shù)字應(yīng)為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;

}

//減法

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) //如果未輸入第二個操作符，不運(yùn)算，例如連續(xù)輸入+-*/或=

{

switch (strOper) //按上次記錄的運(yùn)算符號運(yùn)算

{

case "+":

sum += dbSencond;

break;

case "-":

sum -= dbSencond;

break;

case "*":

sum *= dbSencond;

break;

case "/":

sum /= dbSencond;

break;

}

}

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

blnClear = true; // 設(shè)置標(biāo)記使鍵入另一個加數(shù)前，先清除顯示的前個加數(shù)

}

//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;

}

//清除當(dāng)前顯示數(shù)字

private void button4_Click(object sender, EventArgs e)

{

textBox1.Text = "0";//顯示屏清空

sum = 0; //臨時(shí)計(jì)算結(jié)果歸零

blnClear = false;

strOper = "+";

}

//清除當(dāng)前計(jì)算

private void button5_Click(object sender, EventArgs e)

{

textBox1.Text = "0";

sum = 0;

blnClear = false;

strOper = "+";

}

//小數(shù)點(diǎn)

private void button30_Click(object sender, EventArgs e)

{

if (blnClear)

{

textBox1.Text = "0";

blnClear = false;

}

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

if (n == -1) //如果沒有小數(shù)點(diǎn)，增加小數(shù)點(diǎn)，否則不增加

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

}

//正負(fù)符號

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)

{

}

}

}

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