本文共 10710 字，大约阅读时间需要 35 分钟。

源码：Form1.cs

软件截图

using System;using System.Collections.Generic;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication1{    public partial class equ : Form   //类equ的起点    {        public equ()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {        }        private void textBox1_TextChanged(object sender, EventArgs e)        {            this.textBox1.SelectionStart = this.textBox1.Text.Length;            this.textBox1.SelectionLength = 0;            this.textBox1.ScrollToCaret();        }        //---按键绑定--------------------        private void equ_KeyPress(object sender, KeyPressEventArgs e)        {            if (e.KeyChar == '1')            {                addNum("1");            }            if (e.KeyChar == '2')            {                addNum("2");            }            if (e.KeyChar == '3')            {                addNum("3");            }            if (e.KeyChar == '4')            {                addNum("4");            }            if (e.KeyChar == '5')            {                addNum("5");            }            if (e.KeyChar == '6')            {                addNum("6");            }            if (e.KeyChar == '7')            {                addNum("7");            }            if (e.KeyChar == '8')            {                addNum("8");            }            if (e.KeyChar == '9')            {                addNum("9");            }            if (e.KeyChar == '0')            {                addNum("0");            }            if (e.KeyChar == '+')            {                ways[index] = '+';                listway.Add('+');                selectways('+');            }            if (e.KeyChar == '-')            {                ways[index] = '-';                listway.Add('-');                selectways('-');            }            if (e.KeyChar == '*')            {                ways[index] = '*';                listway.Add('*');                selectways('*');            }            if (e.KeyChar == '/')            {                ways[index] = '/';                listway.Add('/');                 selectways('/');            }            if (e.KeyChar == '=')            {                answer();            }            if (e.KeyChar == 27)            {                Clear ();            }        }        //成员变量        string numstr = "";        string num_answer="" ;        char[] ways=new char [20] ;     //   运算方式标志                double[] num = new double[20];        int index = 0;        List
   
    listnum =new List
    
     ();  //默认容量4个        List
     
       listway = new List
      
       ();        int calflag1 = 0;    //  + - 标志位        int equflag2 = 0;  //  =标志        //只加数字和.方法addNum        public void addNum(string  num)   //方法 string  +        {            if (calflag1 == 1 && equflag2 == 1)  //第二行计算，包括清零            {                textBox1.Text += "\r\n";   //clear清屏，这里换行                num_answer = "";                numstr = "";                index =0;                calflag1 = 0;                equflag2 = 0;            }            textBox1.Text += num;            numstr += num;        }        private void button1_Click_1(object sender, EventArgs e)        {            addNum("1");        }        private void button2_Click_1(object sender, EventArgs e)        {            addNum("2");        }        private void button3_Click_1(object sender, EventArgs e)        {            addNum("3");        }        private void button4_Click_1(object sender, EventArgs e)        {            addNum("4");        }        private void button5_Click_1(object sender, EventArgs e)        {            addNum("5");        }        private void button6_Click_1(object sender, EventArgs e)        {            addNum("6");        }        private void button7_Click_1(object sender, EventArgs e)        {            addNum("7");        }        private void button8_Click_1(object sender, EventArgs e)        {            addNum("8");        }        private void button9_Click_1(object sender, EventArgs e)        {            addNum("9");        }        private void button10_Click_1(object sender, EventArgs e)        {            addNum("0");        }        private void button11_Click(object sender, EventArgs e)  // .        {            addNum(".");        }        //+        private void button13_Click_1(object sender, EventArgs e)        {            ways[index] = '+';            listway.Add('+');            selectways('+');        }        //-        private void button14_Click_1(object sender, EventArgs e)        {            ways[index] = '-';            listway.Add('-');            selectways('-');        }        //*        private void button15_Click_1(object sender, EventArgs e)        {            ways[index] = '*';            listway.Add('*');            selectways('*');        }        //   /        private void button16_Click_1(object sender, EventArgs e)        {            ways[index] = '/';            listway.Add('/');            selectways('/');        }        //计算符号        private void button12_Click(object sender, EventArgs e)  //=        {            answer();        }        private void button17_Click(object sender, EventArgs e)  //清零        {            Clear();        }        private void button18_Click(object sender, EventArgs e)   //退格键,  不需要处理集合数据        {            if (equflag2 == 0)  //出现= 不能退            {                if (textBox1.Text.Length > 0)                {                    if (textBox1.Text.EndsWith("+") || textBox1.Text.EndsWith("-") || textBox1.Text.EndsWith("*") || textBox1.Text.EndsWith("/"))                    {                        textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);                    }                    else                    {                        textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length  - 1);//移除当前实例中的所有字符，从指定位置开始，一直到最后一个位置为止，并返回字符串。                        numstr = numstr.Remove(numstr.Length - 1);                    }                }            }        }        public void selectways(char ways)   //方法 string  +        {            //已有方法时候不再增加+-            if (textBox1.Text.EndsWith("+") || textBox1.Text.EndsWith("-") || textBox1.Text.EndsWith("*") || textBox1.Text.EndsWith("/"))            {                textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);                textBox1.Text += ways;                listway.RemoveAt(index -1);                //MessageBox.Show(":"+listway .Capacity );            }            else            {                if (numstr.Length > 0)                {                   // num[index] = Convert.ToDouble(numstr);                    listnum.Add(Convert.ToDouble(numstr));                    index++;                    numstr = "";                    switch (ways)                    {                        case '+':                            textBox1.Text += "+";                            break;                        case '-':                            textBox1.Text += "-";                            break;                        case '*':                            textBox1.Text += "*";                            break;                        case '/':                            textBox1.Text += "/";                            break;                    }                    calflag1 = 1;                    equflag2 = 0;                }            }        }        private double  cal(double i, double j, char k)        {                switch (k)                {                    case '+':                       return i + j;                    case '-':                        return i - j;                    case '*':                        return i * j;                    case '/':                        return i / j;                    default:                        return 00000000000;                }               // MessageBox.Show("k="+k);        }        private void answer()   //计算        {            textBox1.Text += "=";            double result=0.0;            try            {             //   num[index] = Convert.ToDouble(numstr);                listnum.Add(Convert.ToDouble(numstr));                index++;            }            catch            {                textBox1.Text = "请输入第二个数";            }            //MessageBox.Show("ways:" + ways[0] +"/n" + "；num1:" + num[0] + "；num2：" + num[1] + "；num_answer :" + num_answer + "; numstr:" + numstr);  //提示框            try            {               // result = num[0];                result = listnum[0];                for (int i = 0; i < index-1; i++)                {                   // char aa = ways[i];                   char   aa = listway [i];                   // MessageBox.Show("aa=" + aa);                    result =  cal(result , listnum[i+1], aa);                }                num_answer = result.ToString();                textBox1.Text += num_answer;            }            catch            {                textBox1.Text = "error";            }            equflag2 = 1;  //等号自己的标志            numstr = "";            listnum.Clear();            listway.Clear();        }        private void Clear()        {            textBox1.Text = "";            num_answer = "";            numstr = "";            calflag1 = 0;            equflag2 = 0;            index =0;            listnum.Clear();            listway.Clear();        }    }}// MessageBox.Show("aa=" + aa);//public bool EndsWith( string value ) 判断 string 对象的结尾是否匹配指定的字符串。//快速删除一行Shift+delete//if (caseflag3 == 1)   //不换行接着计算//{
   //    num2_str += num;//}//else//{
   //    if (equflag2 == 0) //等号标志//    {
   //        if (calflag1 == 0) //没有按计算方法，给第一个变量//        {
   //            num1_str = num1_str + num;//        }//        else //按下计算方法后，数字赋给第二个变量//        {
   //            num2_str += num;//        }//    }//} //if (calflag1 == 1 && equflag2 == 0)  //没有等号下，按运算符//{
   //    num2_str = numstr;//    double temp1 = Convert.ToDouble(num1_str);//    double temp2 = Convert.ToDouble(num2_str);//    switch (ways)//    {
   //        case 1://            num_answer = (temp1 + temp2).ToString();//            break;//        case 2://            num_answer = (temp1 - temp2).ToString();//            break;//        case 3://            num_answer = (temp1 * temp2).ToString();//            break;//        case 4://            num_answer = (temp1 / temp2).ToString();//            break;//    }//    equflag2 = 1;  //等号自己的标志//    num1_str = "";//    num2_str = "";//    numstr = "";//}