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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);
}
}
}
}
GitHub源码下载：
https://github.com/kiritobin/EasyCal
注意：这个计算器只能两两数值相计算，不能实现多个数值混合运算，即不能实现1+1+1，
原文链接：https://www.idaobin.com/archives/982.html
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