作业基本要求
基本要求：
- 除了整数以外，还能支持真分数的四则运算。
- 对实现的功能进行描述，并且对实现结果要求截图。
设计思想：首先思考运算数字范围，考虑小学生的运算能力，然后分类运算方法，分为加减乘除混合运算，
然后可以选择是继续做题还是退出程序，可以总结做对或者做错的题数，方便计算正确以及错误的题数。
源代码
using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; namespace ConsoleApplication1 { class Class1 { private static Dictionary _operatorLevel; public static void Main(string[] arg) { Console.WriteLine("Type in the source expr"); string sourceExpression = Console.ReadLine(); Console.WriteLine(InsertBlank(sourceExpression)); string rpnExperssion = ConvertToRPN(InsertBlank(sourceExpression)); Console.WriteLine(rpnExperssion); Console.WriteLine(GetResult(rpnExperssion)); Console.ReadLine(); } public static double GetValue(double left, double right, char _operator) { switch (_operator) { case '+': return left+right; case '-': return left-right; case '*': return left*right; case '/': return left/right; } return 0; } public static double GetResult(string source) { Stack stack = new Stack (); var list = source.Split(' '); for (int i = 0; i < list.Length; i++) { string current = list[i]; if (Regex.IsMatch(current, "^([0-9]{1,}){1}")) { stack.Push(current); } else if (OperatorLevel.ContainsKey(current)) { double right = double.Parse(stack.Pop()); double left = double.Parse(stack.Pop()); stack.Push(GetValue(left, right, current[0]).ToString()); } } return double.Parse(stack.Pop()); } public static string ConvertToRPN(string source) { StringBuilder result = new StringBuilder(); Stack stack = new Stack (); string[] list = source.Split(' '); for (int i = 0; i < list.Length ; i++) { string current = list[i]; if (Regex.IsMatch(current, "^([0-9]{1,}){1}")) { result.Append(current + " "); } else if (OperatorLevel.ContainsKey(current)) { if (stack.Count > 0) { var prev = stack.Peek(); if (prev == "(") { stack.Push(current); continue; } if (current == "(") { stack.Push(current); continue; } if (current == ")") { while (stack.Count > 0 && stack.Peek() != "(") { result.Append(stack.Pop() + " "); } //Pop the "(" stack.Pop(); continue; } if (OperatorLevel[current] < OperatorLevel[prev]) { while (stack.Count > 0) { var top = stack.Pop(); if (top != "(" && top != ")") { result.Append(top + " "); } else { break; } } stack.Push(current); } else { stack.Push(current); } } else { stack.Push(current); } } } if (stack.Count > 0) { while (stack.Count > 0) { var top = stack.Pop(); if (top != "(" && top != ")") { result.Append(top + " "); } } } return result.ToString(); } public static string InsertBlank(string source) { StringBuilder sb = new StringBuilder(); var list = source.ToCharArray(); foreach (var temp in list) { if (OperatorLevel.ContainsKey(temp.ToString())) { sb.Append(" "); sb.Append(temp.ToString()); sb.Append(" "); } else { sb.Append(temp); } } return sb.ToString(); } //运算符字典 方便查询运算符优先级 public static Dictionary OperatorLevel { get { if(_operatorLevel==null) { _operatorLevel = new Dictionary (); _operatorLevel.Add("+", 0); _operatorLevel.Add("-", 0); _operatorLevel.Add("(", 1); _operatorLevel.Add("*", 1); _operatorLevel.Add("/", 1); _operatorLevel.Add(")", 0); } return _operatorLevel; } } }} void main(){ printf("\n欢迎进入小学四则运算\n\n"); while(1) { int con=0,choose=0; printf("请选择:\n"); printf("加法运算请输入(1)\n"); printf("减法运算请输入(2)\n"); printf("乘法运算请输入(3)\n"); printf("除法运算请输入(4)\n"); printf("混合运算请输入(5)\n"); if(con==0) scanf("%d",&choose); switch(choose) { case 1:add();break; case 2: minu(); break; case 3: mul(); break; case 4: di(); break; case 5: hunhe(); break; } printf("\n重新选择？请输入（1）\n"); printf("\n退出运算？请输入（2）\n"); scanf("%d",&con); if(con==1) con=1; if(con==2) break; } printf("您总共完成%d道题\n正确%d道\n错误%d道\n",right+wrong,right,wrong);} 程序截图
。
总结：
通过这次作业，我发现自己在编程方面还有许多的不足。自己在C#方面还有许多的东西要学习。这次作业中我通过网络，书籍，还有询问同学，才将作业完成。编程需要平时的积累，在平日我们积少成多，在编程时我们才能更好地编程。以后在上课时，我要更多的跟着老师走，有不懂的多问老师。