前几天老师讲的，今天才想起来完善一下。
发现Visual Studio有那么点小好用~
Visual Studio的简易用法
1.添加组件：直接将工具箱中的组件直接到框架中
2.更改名称文本等：单击组件，右下角的属性中进行更改
3.添加动作事件：双击组件，进入代码页面，输入相应代码。
简易计算器
我是根据我手机上的小米计算器制作的页面：
全部代码如下：
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 计算器
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button10_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "5";
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "1";
}
private void button2_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "2";
}
private void button3_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "3";
}
private void button4_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "4";
}
private void button6_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "6";
}
private void button7_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "7";
}
private void button8_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "8";
}
private void button9_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "9";
}
private void button0_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "0";
}
private void button_spot_Click(object sender, EventArgs e)
{
textBox1.Text += ".";
}
private void buttonAC_Click(object sender, EventArgs e)
{
textBox1.Text = "0";
history.Text = "";
}
private void button_back_Click(object sender, EventArgs e)
{
int length = textBox1.TextLength; //取字符串的长度
if(length > 0)
textBox1.Text = textBox1.Text.Substring(0, length - 1);//取子串，去掉最后一个字符
}
double i, j, k;
char flag; //标志变量，表示运算
private void button_div_Click(object sender, EventArgs e)
{
i = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";//置空
history.Text = i.ToString() + '/';
flag = '/';
}
private void button_multiply_Click(object sender, EventArgs e)
{
i = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";//置空
history.Text = i.ToString() + 'x';
flag = 'x';
}
private void button_subtract_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "-";
else
{
i = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";//置空
history.Text = i.ToString() + '-';
flag = '-';
}
}
private void button_plus_Click(object sender, EventArgs e)
{
i = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";//置空
history.Text = i.ToString() + '+';
flag = '+';
}
private void history_TextChanged(object sender, EventArgs e)
{
}
private void button_equal_Click(object sender, EventArgs e)
{
j = Convert.ToDouble(textBox1.Text);
history.Text += j.ToString();
switch (flag)
{
case '+':
{
k = i + j;
break;
}
case '-':
{
k = i - j;
break;
}
case 'x':
{
k = i * j;
break;
}
case '/':
{
if(j == 0)
{
textBox1.Text = "∞";
break;
}
else
{
k = i / j;
break;
}
}
case '%':
{
if (i - (int)i != 0 || j - (int)j != 0 || j == 0)
{
textBox1.Text = "Error"; //整数才能进行求余运算
break;
}
k = i % j;
break;
}
}
if (textBox1.Text != "∞" && textBox1.Text != "Error")
{
history.Text += "=" + k.ToString();
textBox1.Text = "0";
}
else
{
history.Text += "=" + textBox1.Text;
textBox1.Text = "0";
}
}
private void button_surplus_Click(object sender, EventArgs e)
{
i = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";//置空
history.Text = i.ToString() + '%';
flag = '%';
}
}
}
部分代码分析：
①数字键的处理
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0")
textBox1.Text = "";
textBox1.Text += "1";
}
②运算键
i，j 分别存储两个运算数；flag 字符型 存储运算符。
当按下 = 键的时候，根据flag，对i，j做运算（采用switch…case…语句）。
private void button_equal_Click(object sender, EventArgs e)
{
j = Convert.ToDouble(textBox1.Text);
history.Text += j.ToString();
switch (flag)
{
case '+':
{
k = i + j;
break;
}
case '-':
{
k = i - j;
break;
}
case 'x':
{
k = i * j;
break;
}
case '/':
{
if(j == 0)
{
textBox1.Text = "∞";
break;
}
else
{
k = i / j;
break;
}
}
case '%':
{
if (i - (int)i != 0 || j - (int)j != 0 || j == 0)
{
textBox1.Text = "Error"; //整数才能进行求余运算
break;
}
k = i % j;
break;
}
}
if (textBox1.Text != "∞" && textBox1.Text != "Error")
{
history.Text += "=" + k.ToString();
textBox1.Text = "0";
}
else
{
history.Text += "=" + textBox1.Text;
textBox1.Text = "0";
}
}
注：
1.当没有输入数的时候，减号可以做负号
2.做除法时，除数不能为零
3.求余运算必须是整数操作数
功能实现：
①AC 全部清除键
②← 倒退键
③加法运算
（输入过程均如上，以下运算省略）
④减法运算
⑤乘法运算
⑥除法运算
⑦求余运算（小数不能求余）
负数求余
完美结束~
缺陷：
1.不能进行连续运算
2.只能进行简易运算，平方，开方，指数等未涉及
3.因为不能进行连续运算，所以也没有涉及到运算优先级的问题，难度明显降低。
用时一小时，但我依旧比较满意，起码它看起来像是那么回事~~
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