C#作业——表达式计算器+过程显示

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public String expression;        public String result="";        public class op        {            public char symbol;//符号            public int grade;//优先级            public int minus=0;            public op(char sym)            {                symbol = sym;                if ((symbol == '+') || (symbol == '-'))                    grade = 0;                else if ((symbol == '*') || (symbol == '/'))                    grade = 1;                else if (symbol == '(')                    grade = -2;                else if (symbol == ')')                   grade = -3;                else if (symbol == '=')                    grade = 0;                            }            public double calculate(double p1,double p2)            {                if (symbol == '+')                return p1 + p2;                else if (symbol == '-')                return p1 - p2;                else if (symbol == '*')                return p1 * p2;                else if (symbol == '/')                    return p1 / p2;                else                    return p2;                           }        }        public class datanum        {            public double number;            public bool isdeleted = false;            public datanum(double num)            {                number = num;            }            public void delete()            {                isdeleted = true;            }        }        public Form1()        {            InitializeComponent();            textBox2.ReadOnly = true;        }        private void Form1_Load(object sender, EventArgs e)        {        }        private void textBox1_TextChanged(object sender, EventArgs e)        {            expression = textBox1.Text;        }        private void button1_Click(object sender, EventArgs e)        {           // textBox1.Clear();            result =result+expression + "=" + Result(expression)+"\r\n";            textBox2.Text = result ;            textBox1.Text =""+ Result(expression);            textBox2.ScrollToCaret();            this.textBox2.Focus();//获取焦点            this.textBox2.Select(this.textBox2.TextLength-1, 0);//光标定位到文本最后            this.textBox2.ScrollToCaret();//滚动到光标处            this.textBox1.Focus();            this.textBox1.Select(this.textBox1.TextLength, 0);        }        private double Result(String expression)        {            int length = expression.Length;            char[] a = expression.ToCharArray(0, length);            datanum[] data = new datanum[100];            op[] oper = new op[100];            int datacount = 0, opercount = 0;            double temp = 0;            int dicimal = -1;            double tempdi = 1;            int brcount=0;            for (int m = 0; m < length; m++)            {                if (Char.IsDigit(a[m]) == true)                {                    if (dicimal == -1)                    {                        temp *= 10;                        temp += a[m] - '0';                    }                    else                    {                        dicimal++;                        for (int q = 0; q < dicimal; q++)                            tempdi = tempdi * 0.1;                        temp = temp + (a[m] - '0') * tempdi;                        tempdi = 1;                    }                }                else if (a[m] == '.')                {                    dicimal = 0;                }                else if (a[m] == ')')                {                    int q = m;                    brcount = 0;                    for (; q > 0; q--)                    {                        if (a[q] == ')')                            break;                        else                            brcount++;                    }                    for (int z = 0; z < brcount; z++)                    {                        oper[opercount - z].grade += 2;                    }                }                else if (a[m] == '(')                {                }                else                {                    dicimal = -1;                    tempdi = 1;                    data[datacount] = new datanum(temp);                    datacount++;                    temp = 0;                    oper[opercount] = new op(a[m]);                    opercount++;                }            }            data[datacount] = new datanum(temp);//最后一个数            datacount++;            /*  int temp1 = 0;               int tempdata = 0;               while (temp1 < opercount)               {                   double para1 = data[tempdata].number;                   tempdata++;                   double para2 = data[tempdata].number;;                   if (oper[temp1].symbol == '+')                   { data[tempdata].number = para1 + para2; }                   else if (oper[temp1].symbol == '-')                   { data[tempdata].number = para1 - para2; }                   else if (oper[temp1].symbol == '*')                   { data[tempdata].number = para1 * para2; }                   else if (oper[temp1].symbol == '/')                   { data[tempdata].number = para1 / para2; }                   temp1++;               }               return data[tempdata].number;*/            double n=0;            int temp1;            int tempgrade = 1;            int[] lossdata = new int[10];            int pa=0;            int pb=0;            while(tempgrade>=-1)            {            for (temp1 = 0; temp1 < opercount; temp1++)            {                   if (oper[temp1].grade == tempgrade)                {                     pa = temp1;                     pb = temp1 + 1;                    while(data[pa].isdeleted==true)                    {                        pa--;                    }                     while(data[pb].isdeleted==true)                     {                        pb++;                     }                    data[pa].number=oper[temp1].calculate(data[pa].number, data[pb].number);                    n = data[pa].number;                    data[pb].delete();                }            }            tempgrade--;        }            return n;        }        private void button2_Click(object sender, EventArgs e)        {            textBox1.Clear();        }        private void textBox2_TextChanged(object sender, EventArgs e)        {        }    }}