实现效果：
Form1.cs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.Threading.Tasks;
using System.Windows.Forms;
namespace Cal
{
public partial class Form1 : Form
{
public double num1;
public int temp = 0; //记录存储计算方式
public Form1()
{
InitializeComponent();
}
private void eq_Click( object sender, EventArgs e)
{
switch (temp)
{
//加法运算
case 1:
try
{
result.Text = (num1 + double .Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break ;
//减法运算
case 2:
try
{
result.Text = (num1 - double .Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break ;
//乘法运算
case 3:
try
{
result.Text = (num1 * double .Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break ;
//除法运算，讨论分母为零的情况
case 4:
if ( double .Parse(result.Text)==0)
{
MessageBox.Show( "除数不能为零" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
result.ResetText();
}
else
{
result.Text = (num1 / double .Parse(result.Text)).ToString(); temp = 0;
}
break ;
case 5:
try
{
result.Text = (num1 % double .Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break ;
}
}
private void empty_Click( object sender, EventArgs e)
{
result.Text = "0" ;
num1 = 0;
temp = 0;
//清除
//if (result.Text.Length > 0)
//{
// result.Text = result.Text.Substring(0, result.Text.Length - 1);
//}
}
private void Zero_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "0" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "0" ;
}
}
private void one_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "1" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "1" ;
}
}
private void two_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "2" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "2" ;
}
}
private void three_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "3" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "3" ;
}
}
private void four_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "4" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "4" ;
}
}
private void five_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "5" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "5" ;
}
}
private void six_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "6" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "6" ;
}
}
private void seven_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "7" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "7" ;
}
}
private void eight_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "8" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "8" ;
}
}
private void nine_Click( object sender, EventArgs e)
{
if (result.Text == "0" )
{
result.Text = "9" ;
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "9" ;
}
}
private void point_Click( object sender, EventArgs e)
{
//小数点按键，初始为空，直接按 . 键则显示为0.多少
if (result.Text == "" )
{
result.Text = "0." ;
}
//如果再次输入.则返回都输入的字符后边并提示信息
else if (result.Text.IndexOf( "." ) >= 0)
{
MessageBox.Show( "已经输入小数点,无须再次输入" , "提示" );
}
else
{
//前边有数字时，则直接在后边加上.
result.Text = result.Text + "." ;
}
}
private void add_Click( object sender, EventArgs e)
{
temp = 1;
try
{
num1 = double .Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "" ; //随后让文本框归空
}
}
private void mul_Click( object sender, EventArgs e)
{
temp = 3;
try
{
num1 = double .Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "" ; //随后让文本框归空
}
}
private void sub_Click( object sender, EventArgs e)
{
temp = 2;
try
{
num1 = double .Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "" ; //随后让文本框归空
}
}
private void Button1_Click( object sender, EventArgs e)
{
temp = 4;
try
{
num1 = double .Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "" ; //随后让文本框归空
}
}
private void per_Click( object sender, EventArgs e)
{
temp = 5;
try
{
num1 = double .Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "" ; //随后让文本框归空
}
}
private void opp_Click( object sender, EventArgs e)
{
//temp = 6;
try
{
result.Text = (- double .Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show( "还没输入数字呢" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
}
private void Form1_Load( object sender, EventArgs e)
{
result.Text = "0" ;
}
private void result_TextChanged( object sender, EventArgs e)
{
if (result.Text.Length > 18&& result.Text.Length<36)
{
result.Font = new Font(result.Font.FontFamily, 15, result.Font.Style);
}
if (result.Text.Length > 36&&result.Text.Length<45)
{
result.Font = new Font(result.Font.FontFamily, 10, result.Font.Style);
}
if (result.Text.Length > 45)
{
MessageBox.Show( "超出范围，将要清空了！" , "错误提示" , MessageBoxButtons.OK, MessageBoxIcon.Warning);
result.ResetText();
result.Font = new Font(result.Font.FontFamily, 20, result.Font.Style);
}
}
}
}
小编已经测试了代码，大家可以跟着做一下看看，感谢大家对服务器之家的支持。
原文链接：https://www.idaobin.com/archives/982.html
dy("nrwz");