四则运算3
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题目：
要求用户输入结果，并判断正误，如果错误，给出正确结果。
分析：
将产生式保存到文本文档，然后在以字符串的形式保存到字符数组，然后通过字符数组保存到字符串数组，然后再以栈的形式计算结果。
源程序：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; namespace siz { class Program { static int top; static int x1, y1; static int size = 256; static string [] s=new string[size]; static double jisuan_ma(char [] str) { int l; double right1; int k=0; char ww; string []str1=new string[size]; string []post=new string[size]; l=str.Length; for (int i=0;i<l;i++) { ww=str[i]; switch (ww) { case ‘=‘: str1[k]="="; k++; break; case ‘(‘: str1[k]="("; k++; break; case ‘+‘: str1[k]="+"; k++; break; case ‘-‘: str1[k]="-"; k++; break; case ‘*‘: str1[k]="*"; k++; break; case ‘/‘: str1[k]="/"; k++; break; case ‘)‘: str1[k]=")"; k++; break; default: for (int ss=i;;ss++) { if (str[ss]==‘0‘) { str1[k]+="0"; } else if (str[ss]==‘1‘) { str1[k]+="1"; } else if (str[ss]==‘2‘) { str1[k]+="2"; } else if (str[ss]==‘3‘) { str1[k]+="3"; } else if (str[ss]==‘4‘) { str1[k]+="4"; } else if (str[ss]==‘5‘) { str1[k]+="5"; } else if (str[ss]==‘6‘) { str1[k]+="6"; } else if (str[ss]==‘7‘) { str1[k]+="7"; } else if (str[ss]==‘8‘) { str1[k]+="8"; } else if (str[ss]==‘9‘) { str1[k]+="9"; } else { i=ss-1; break; } } k++; break; } } right1=mid_post(str1,post); return right1; } static void clearstack()//初始化栈 { top = -1; } static int emtystack()//判断栈是否为空 { if (top < 0) { return 1; } else { return 0; } } static string gettop()//得到栈顶元素 { if(emtystack()==1) { return null; } else { return s[top]; } } static void Push(string mid_v)//压栈 { if(top>=size-1) { } else { top++; s[top]=mid_v; } } static string pop()//出栈 { if(emtystack()==1) { return null; } else { top--; return s[top+1]; } } static int precede(string x,string y)//判断优先级 { if (x=="=") { x1=0; } if (x=="(") { x1=1; } if (x=="+") { x1=2; } if (x=="-") { x1=2; } if (x=="*") { x1=3; } if (x=="/") { x1=3; } if (y=="=") { y1=0; } if (y=="+") { y1=2; } if (y=="-") { y1=2; } if (y=="*") { y1=3; } if (y=="/") { y1=3; } if (y=="(") { y1=4; } if (x1>=y1) { return 1; } else { return 0; } } static double mid_post(string []str,string []post)// { double right; int i = 0, j = 0; string x; clearstack(); Push("="); do { x=str[i++]; if (x=="=") { while (emtystack()==0) { post[j++]=pop(); } } else if (x==")") { while (gettop()!="(") { post[j++]=pop(); } pop(); } else if (x=="+"||x=="-"||x=="*"||x=="/"||x=="(") { while (precede(gettop(),x)==1) { post[j++]=pop(); } Push(x); } else { post[j++]=x; } } while (x!="="); right = postcount(post); return right; } static double postcount(string []post)//计算 { int i=0; double z,a,b; clearstack(); string x; string xx; while (post[i]!="=") { x=post[i]; if (x=="+") { b = (double)Convert.ToSingle(pop()); a = (double)Convert.ToSingle(pop()); z=a+b; xx = z.ToString(); Push(xx); } else if (x=="-") { b = (double)Convert.ToSingle(pop()); a = (double)Convert.ToSingle(pop()); z=a-b; xx=z.ToString(); Push(xx); } else if (x=="*") { b = (double)Convert.ToSingle(pop()); a = (double)Convert.ToSingle(pop()); z=a*b; xx=z.ToString(); Push(xx); } else if (x=="/") { b = (double)Convert.ToSingle(pop()); a = (double)Convert.ToSingle(pop()); z=a/b; xx=z.ToString(); Push(xx); } else { Push(x); } i++; } if (emtystack() == 0) { x=gettop(); b = (double)Convert.ToSingle(pop()); return b; } else { return 0; } } static Random rnd = new Random(); static void Main(string[] args) { String path; int num_min, num_max;//数据范围的上限和下限 int num_topic;//题目个数 int num_number;//表达式所含数字个数 int num_milde; String word_ch;//判断乘除 String word_ys = "N";//判断余数 String word_k = "N";//判断括号 String word_fs = "N";//判断有无负数 Console.WriteLine("请输入题目个数："); num_topic = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("请输入表达式所含数字个数："); num_number = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("请输入范围下限："); num_min = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("请输入范围上限："); num_max = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("是否有乘除（Y/N）："); word_ch = Console.ReadLine(); if (num_number == 2) { if (word_ch == "Y") { Console.WriteLine("是否有余数（Y/N）："); word_ys = Console.ReadLine(); } if (num_min >= 0) { Console.WriteLine("是否有负数（Y/N）："); word_fs = Console.ReadLine(); } } else { Console.WriteLine("是否有括号（Y/N）："); word_k = Console.ReadLine(); } int[,] Data = new int[num_topic, num_number];//保存数据 int[,] Operator = new int[num_topic, num_number];//保存运算符 int[] Data_first = new int[num_topic];//保存每个表达式的首个字符 int[,] kuohao = new int[num_topic, num_number]; if (word_ch == "Y") { for (int ii = 0; ii < num_topic; ii++) { for (int jj = 0; jj < num_number - 1; jj++) { Operator[ii, jj] = rnd.Next(1, 5); } Operator[ii, num_number - 1] = 5; } } else { for (int i = 0; i < num_topic; i++) { for (int j = 0; j < num_number - 1; j++) { Operator[i, j] = rnd.Next(1, 3); } Operator[i, num_number - 1] = 5; } } Data_first[0] = rnd.Next(num_min, num_max);//以第一个操作数的不同来使表达式不会重复 for (int s = 1; s < num_topic; s++) { Data_first[s] = rnd.Next(num_min, num_max); for (int h = 0; h < s - 1; h++) { if (Data_first[s] == Data_first[h]) { s--; } } } for (int x = 0; x < num_topic; x++) { Data[x, 0] = Data_first[x]; for (int y = 1; y < num_number; y++) { if (Operator[x, y - 1] == 4) { for (; ; ) { Data[x, y] = rnd.Next(num_min, num_max); if (Data[x, y] != 0) { break; } } } else { Data[x, y] = rnd.Next(num_min, num_max); } } } if (word_fs == "N") { for (int i1 = 0; i1 < num_topic; i1++) { if (Operator[i1, 0] == 2 && Data[i1, 0] < Data[i1, 1]) { num_milde = Data[i1, 1]; Data[i1, 1] = Data[i1, 0]; Data[i1, 0] = num_milde; } } } if (word_ch == "Y") { if (word_ys == "N") { for (int i2 = 0; i2 < num_topic; i2++) { if (Operator[i2, 0] == 4) { num_milde = Data[i2, 0] % Data[i2, 1]; while (num_milde != 0) { Data[i2, 1] = rnd.Next(1, Data[i2, 0]+1); num_milde = Data[i2, 0] % Data[i2, 1]; } } } } } if (word_k == "Y") { for (int j1 = 0; j1 < num_topic; j1++) { for (int j2 = 0; j2 < num_number - 2; j2++) { kuohao[j1, j2] = rnd.Next(0, 2); } kuohao[j1, num_number - 2] = 0; kuohao[j1, num_number - 1] = 0; } } path = @"1.txt"; StreamWriter strm1 = File.CreateText(path); for (int x1 = 0; x1 < num_topic; x1++) { for (int x2 = 0; x2 < num_number; x2++) { if (kuohao[x1, x2] == 1) { strm1.Write("("); strm1.Write(Data[x1, x2]); if (Operator[x1, x2] != 5) { if (Operator[x1, x2] == 1) { strm1.Write("+"); } if (Operator[x1, x2] == 2) { strm1.Write("-"); } if (Operator[x1, x2] == 3) { strm1.Write("*"); } if (Operator[x1, x2] == 4) { strm1.Write("/"); } } } else { strm1.Write(Data[x1, x2]); if (Operator[x1, x2] != 5) { if (Operator[x1, x2] == 1) { strm1.Write("+"); } if (Operator[x1, x2] == 2) { strm1.Write("-"); } if (Operator[x1, x2] == 3) { strm1.Write("*"); } if (Operator[x1, x2] == 4) { strm1.Write("/"); } } else { for (int x3 = 0; x3 < num_number; x3++) { if (kuohao[x1, x3] == 1) { strm1.Write(")"); } } strm1.Write("="); } } } strm1.WriteLine(); } strm1.Close(); StreamReader strm2 = File.OpenText(path); string s_mid = ""; char[] strr = new char[size]; double answer; double right; int right_an=0; int wrong_an=0; for (int o = 0; o < num_topic; o++) { s_mid = strm2.ReadLine(); strr = s_mid.ToCharArray(0, s_mid.Length); Console.WriteLine(s_mid); right = jisuan_ma(strr); Console.WriteLine("请输入答案："); answer = Convert.ToDouble(Console.ReadLine()); if (answer == right) { Console.WriteLine("回答正确！"); right_an++; } else { Console.WriteLine("回答错误！正确答案为：{0}",right); wrong_an++; } } Console.WriteLine("本次答题共计正确：{0}道题，错误{1}道题！", right_an, wrong_an); } } }
运行结果：
合作截图：
项目记录日志（单位：小时（h））：
| 听课 | 编写程序 | 阅读相关书籍 | 网上查找资料 | 日总计 | |
|
周一 |
2 | 1 | 0.5 | 3.5 | |
|
周二 |
3 | 3 | |||
|
周三 |
8 | 1 | 9 | ||
|
周四 |
2 | 2 | |||
|
周五 |
3 | 3 | |||
|
周六 |
2 | 2 | |||
|
周日 |
|||||
|
周总计 |
4 | 16 | 2 | 0.5 | 22.5 |
时间记录日志：
| 日期 | 开始时间 | 结束时间 | 中间时间（分钟） | 净时间（分钟） | 活动 | 备注 |
| 3.14 | 14:00 | 15:50 | 10 | 100 | 听课 | 软件工程上课 |
| 20:00 | 21:00 | 60 | 阅读 | 阅读构建之法 | ||
| 3.15 | 18:00 | 21:00 | 30 | 150 | 编写程序 | 编写四则运算程序 |
| 3.16 | 13:00 | 21:00 | 60 | 420 | 编写程序 | 编写四则运算程序 |
| 20:00 | 21:00 | 60 | 阅读 | 阅读构建之法 | ||
| 3.17 | 14:00 | 15:50 | 10 | 100 | 上课 | 软件工程上课 |
| 3.18 | 18:00 | 21:00 | 180 | 编写程序 | 编写四则运算程序 | |
| 3.19 | 10:00 | 12:00 | 120 | 编写程序 | 四则运算程序的修改，调试，完善 |
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