界面
这个程序十分简单，我觉得比较重要的设计思路就是双目和单目运算符的不同算法，双目运算符要记录两个数字，而单目运算符记录一个数字，并且两者算法都在点击下一个运算符的时候，使用上一次运算符进行计算得出结果。其次的问题就是一些细节和一些特殊情况下可能会出的bug。
源代码
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 Calculator
{
public partial class Form1 : Form
{
bool isAppend; //控制数字输入
string preOper = null; //前一位运算符
double result; //运算结果
bool Useequal = false; //判断等号是否使用
bool Usedot = false; //判断小数点是否使用
bool UseNegative = false; //判断负数符号是否使用
//textbox1为输入框
//textbox2为运算式显示框
public Form1() //主窗体
{
InitializeComponent();
}
private void NumClicked(object sender, EventArgs e) //数字按钮click函数
{
string num = ((Button)sender).Text;
Textdisplay(num);
NumInput(num);
}
private void Textdisplay(string num) //第一行的运算式的显示函数
{
this.textBox2.Text += num;
}
private void NumInput(string num) //数字输入
{
if (Useequal == true)
{
this.textBox2.Text = num;
Useequal = false;
}
if (isAppend)
{
this.textBox1.Text += num;
}
else
{
this.textBox1.Text = num;
}
isAppend = true;
this.textBox1.Focus();
this.textBox1.SelectionStart = this.textBox1.Text.Length;
}
private void DoubleClicked(object sender, EventArgs e) //双目运算符click函数
{
string curOper = ((Button)sender).Text;
if(this.textBox2.Text.Last()=='+'|| this.textBox2.Text.Last() == '-' ||
this.textBox2.Text.Last() == '*' || this.textBox2.Text.Last() == '/' )
{
this.textBox2.Text = this.textBox2.Text.Remove(this.textBox2.Text.Length - 1, 1)+curOper;
preOper = curOper;
}
else
{
Textdisplay(curOper);
DoubleOperInput(curOper);
}
this.textBox1.Focus();
}
private void DoubleOperInput(string curOper) //双目运算符输入
{
if (Useequal == true)
Useequal = false;
if (preOper == null)
{
preOper = curOper;
this.result = double.Parse(this.textBox1.Text);
}
else
{
double curNum = double.Parse(this.textBox1.Text);
switch (preOper)
{
case "+": this.result += curNum; break;
case "-": this.result -= curNum; break;
case "*": this.result *= curNum; break;
case "/": this.result /= curNum; break;
}
this.textBox1.Text = result.ToString();
preOper = curOper;
}
isAppend = false;
Usedot = false;
UseNegative = false;
}
private void SingleClick(object sender, EventArgs e) ////单目运算符click函数
{
if (Useequal == true)
Useequal = false;
double curNum = double.Parse(this.textBox1.Text);
string curOper = ((Button)sender).Text;
Textdisplay(curOper);
switch (curOper)
{
case "sqrt": curNum=Math.Sqrt(curNum); break;
case "1/x": curNum=1/curNum; break;
case "x^2": curNum=curNum*curNum; break;
case "sin": curNum = Math.Sin(Math.PI * (curNum / 180)); break;
}
this.textBox1.Text = curNum.ToString();
Usedot = false;
UseNegative = false;
isAppend = false;
this.textBox1.Focus();
this.textBox1.SelectionStart = this.textBox1.Text.Length;
}
private void DotClick(object sender, EventArgs e) //小数点click函数
{
string curOper = ((Button)sender).Text;
DotInput(curOper);
}
private void DotInput(string curOper) //小数点输入
{
if (Usedot == false)
{
if (Useequal == true)
{
this.textBox2.Text = "0" + curOper;
this.textBox1.Text = "0" + curOper;
Useequal = false;
isAppend = true;
}
else if (this.textBox1.Text == "")
{
this.textBox2.Text = "0" + curOper;
this.textBox1.Text = "0" + curOper;
isAppend = true;
}
else if (!char.IsDigit(this.textBox2.Text.Last()))
{
this.textBox2.Text += "0" + curOper;
this.textBox1.Text = "0" + curOper;
isAppend = true;
}
else
{
this.textBox1.Text += curOper;
this.textBox2.Text += curOper;
}
Usedot = true;
}
this.textBox1.Focus();
}
private void EqualClick(object sender, EventArgs e) //等于按钮click函数
{
DoubleClicked(btnEquals,null);
this.textBox2.Text =result.ToString();
preOper = null;
Useequal = true;
Usedot = false;
UseNegative = false;
this.textBox1.Focus();
}
private void BackClick(object sender, EventArgs e) //退格click函数
{
if (isAppend&& this.textBox1.Text!="")
{
this.textBox1.Text = this.textBox1.Text.Remove(this.textBox1.Text.Length-1,1);
this.textBox2.Text = this.textBox2.Text.Remove(this.textBox2.Text.Length - 1, 1);
}
this.textBox1.Focus();
}
private void ClearClick(object sender, EventArgs e) //清除
{
this.textBox1.Text = "";
this.textBox2.Text = "";
preOper = null;
Usedot = false;
Useequal = false;
UseNegative = false;
this.textBox1.Focus();
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e) //键盘输入
{
e.Handled = true;
if (char.IsDigit(e.KeyChar))
{
Textdisplay(e.KeyChar.ToString());
NumInput(e.KeyChar.ToString());
}
else if(e.KeyChar == '.')
{
DotInput(e.KeyChar.ToString());
}
else if (e.KeyChar == '+'||e.KeyChar == '-' || e.KeyChar == '*' || e.KeyChar == '/'){
Textdisplay(e.KeyChar.ToString());
DoubleOperInput(e.KeyChar.ToString());
}
else if(e.KeyChar== 8) //退格符的ascii码为8
{
BackClick(null, null);
}
else if(e.KeyChar==13) //等于符的ascii码为13
{
EqualClick(null, null);
}
this.textBox1.SelectionStart = this.textBox1.Text.Length;
}
private void Negative(object sender, EventArgs e) //负数click函数
{
if (UseNegative == false)
{
if (this.textBox1.Text == "")
{
this.textBox1.Text = "-";
this.textBox2.Text = "(-)";
isAppend = true;
}
else if (Useequal == true)
{
this.textBox1.Text = "-";
this.textBox2.Text = "(-)";
Useequal = false;
isAppend = true;
}
else if(!char.IsDigit(this.textBox2.Text.Last()))
{
this.textBox2.Text += "(-)";
this.textBox1.Text = "-";
isAppend = true;
}
}
UseNegative = true;
}
}
}
资源下载
链接: https://pan.baidu.com/s/1HcoEnuY–p0vtCPMfEtl4g 提取码: g8kn
