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Form1.cs
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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.Threading.Tasks;
using System.Windows.Forms;
namespace jisuanqi
{
public partial class mainForm : Form
{
public mainForm()
{
InitializeComponent();
}
//字符串声明
//string tempStrNum1 = "";
string tempStrOperator = "";
//数字声明
double num1 = 0;
double num2 = 0;
double result = 0;
private void mainForm_Load(object sender, EventArgs e)
{
}
private void ButtonNum_Click(object sender, EventArgs e)
{
Button buttonNumber = (Button)sender;
if (lblShow.Text == "0")
{
//判断输入的是否为小数点。
if (buttonNumber.Text != ".")
lblShow.Text = buttonNumber.Text;
else
lblShow.Text += buttonNumber.Text;
//tempStrNum1 = str1;
}
else
{
lblShow.Text += buttonNumber.Text;
//tempStrNum1 += str1;
//lblShow.Text = "9";
}//if (lblShow.Text == "0")
}
//
//操作符按钮方法
//
private void ButtonOperator_Click(object sender, EventArgs e)
{
Button buttonOperator = (Button)sender;
//tempStrOperator = buttonOperator.Text;
if (buttonOperator.Text != "=")
{
//
//查找运算符
//
switch (buttonOperator.Text)
{
case "+":
{
tempStrOperator = buttonOperator.Text;
lblShow.Text += tempStrOperator;
} break;
case "-":
{
tempStrOperator = buttonOperator.Text;
lblShow.Text += tempStrOperator;
}
break;
case "×":
{
tempStrOperator = buttonOperator.Text;
lblShow.Text += tempStrOperator;
}
break;
case "÷":
{
tempStrOperator = buttonOperator.Text;
lblShow.Text += tempStrOperator;
}
break;
}
}
else if (buttonOperator.Text == "=")
{
//string tempStrNum = lblShow.Text;
if (lblShow.Text != "")
{
int j = 0;
for (int i = 0; i < lblShow.Text.Length; i++)
{
//if(tempStrOperator!="")
if (lblShow.Text[i] == '+' || lblShow.Text[i] == '-' || lblShow.Text[i] == '×' || lblShow.Text[i] == '÷')
{
j = i;
break;
}
}//for(int i = 0; i < lblShow.Text.Length; i++)
if (j == 0)
num1 = Convert.ToDouble(lblShow.Text.Substring(0));
else
{
num1 = Convert.ToDouble(lblShow.Text.Substring(0, j));
if (lblShow.Text.Length - 1 >= j + 1)
num2 = Convert.ToDouble(lblShow.Text.Substring(j + 1));
}
//lblShow.Text = lblShow.Text.Substring(j+1);
result = num1 + num2;
string str1 = result.ToString();
lblShow.Text += buttonOperator.Text;//附上等于号
//lblShow.Text = result.ToString();//出现了小数点不能正确运算的问题
//lblShow.Text += num2.ToString();
//lblShow.Text = lblShow.Text+'\n'+ num1.ToString()+'\n'+num2.ToString()+'\n'+result.ToString();
switch (tempStrOperator)
{
case "+":
{
result = num1 + num2;
lblShow.Text += Convert.ToString(result);
} break;
case "-":
{
result = num1 - num2;
lblShow.Text += Convert.ToString(result);
} break;
case "×":
{
result = num1 * num2;
lblShow.Text += Convert.ToString(result);
} break;
case "÷":
{
//判断除数是否为零
if (num2 != 0)
{
result = num1 / num2;
lblShow.Text += Convert.ToString(result);
}
else
lblShow.Text = "不能除以零";
}
break;
}//switch (tempStrOperator)
//
//结果现显示
//
//lblShow.Text += Convert.ToString(result);
//lblShow.Text += Convert.ToString(result);
//lblShow.Text += str1;
//witch()
}
//运算符标记清零
tempStrOperator = "";
}
}
//
//运算函数
//
//
//退格按钮
//
private void button1_Click(object sender, EventArgs e)
{
string tempStr = lblShow.Text;
//如果显示器内字符串长度大于0，则执行退格操作
if (tempStr.Length > 0)
{
lblShow.Text = tempStr.Substring(0, tempStr.Length - 1);
//如果数字暂存区内字符串长度大于0，则执行退格操作
//if (tempStrNum1.Length > 0)
// tempStrNum1 = tempStrNum1.Substring(0, tempStrNum1.Length - 1);
}
}
//
//清屏按钮
//
private void button3_Click(object sender, EventArgs e)
{
lblShow.Text = null;
tempStrOperator = null;
result = 0;
num1 = 0;
num2 = 0;
}
private void button20_Click(object sender, EventArgs e)
{
}
}
}