1、开发环境 vs2005 代码经测试无误
2、此代码根据李建忠老师的视频代码编写
3、注释一条令人迷惑的代码
4、实现YiExpression
using System;using System.Collections.Generic;using System.Text;using System.Collections;
namespace Interpreter{ class Program { static void Main(string[] args) { string roman = "五亿二十四万三千四百零二"; Context context = new Context(roman); ArrayList tree = new ArrayList(); tree.Add(new GeExpression()); tree.Add(new ShiExpression()); tree.Add(new BaiExpression()); tree.Add(new QianExpression()); tree.Add(new WanExpression()); tree.Add(new YiExpression()); foreach(Expression exp in tree) { exp.Interpret(context); } Console.WriteLine("{0}={1}", roman, context.Data);
Console.Read();
} }
public abstract class Expression { public Hashtable hstMap = new Hashtable(); public Expression() { hstMap.Add("一", 1); hstMap.Add("二",2 ); hstMap.Add("三",3 ); hstMap.Add("四",4 ); hstMap.Add("五",5 ); hstMap.Add("六",6 ); hstMap.Add("七", 7); hstMap.Add("八", 8); hstMap.Add("九", 9); } public abstract string GetPostfix(); public abstract int GetMultiplier(); public virtual int GetLength() { return this.GetPostfix().Length + 1; }
public virtual void Interpret(Context context) { if (context.Statement.Length==0) { return; } foreach (string key in hstMap.Keys) { int value = (int)hstMap[key]; if (context.Statement.EndsWith(key+this.GetPostfix())) { context.Data += value * this.GetMultiplier(); context.Statement = context.Statement.Substring(0, context.Statement.Length - this.GetLength()); } if (context.Statement.EndsWith("零")) { context.Statement = context.Statement.Substring(0, context.Statement.Length-1); } } } }//class Expression
public class GeExpression:Expression { public override string GetPostfix() { return ""; } public override int GetMultiplier() { return 1; } } public class ShiExpression : Expression { public override string GetPostfix() { return "十"; } public override int GetMultiplier() { return 10; } } public class BaiExpression : Expression { public override string GetPostfix() { return "百"; } public override int GetMultiplier() { return 100; } } public class QianExpression : Expression { public override string GetPostfix() { return "千"; } public override int GetMultiplier() { return 1000; } }
/// <summary> /// 万和个十百千不一样 /// </summary> public class WanExpression : Expression { public override string GetPostfix() { return "万"; } public override int GetMultiplier() { return 10000; } public override void Interpret(Context context) { if (context.Statement.Length == 0) { return; }
ArrayList tree = new ArrayList(); tree.Add(new GeExpression()); tree.Add(new ShiExpression()); tree.Add(new BaiExpression()); tree.Add(new QianExpression());
//foreach(string key in hstMap.Keys) //此行代码实属无用，个人愚见！！！！！！！！！！！！！！！！ { if(context.Statement.EndsWith(this.GetPostfix())) { int temp = context.Data; context.Data = 0; context.Statement = context.Statement.Substring(0, context.Statement.Length - 1); foreach(Expression exp in tree) { exp.Interpret(context); } context.Data = temp + this.GetMultiplier() * context.Data; } }
}
}
/// 亿和万类似 public class YiExpression : Expression { public override string GetPostfix() { return "亿"; } public override int GetMultiplier() { return 100000000; } public override void Interpret(Context context) { if (context.Statement.Length == 0) { return; }
ArrayList tree = new ArrayList(); tree.Add(new GeExpression()); tree.Add(new ShiExpression()); tree.Add(new BaiExpression()); tree.Add(new QianExpression()); tree.Add(new WanExpression());
// foreach (string key in hstMap.Keys) { if (context.Statement.EndsWith(this.GetPostfix())) { int temp = context.Data; context.Data = 0; context.Statement = context.Statement.Substring(0, context.Statement.Length - 1);
foreach (Expression exp in tree) { exp.Interpret(context); }
context.Data = temp + this.GetMultiplier() * context.Data; } }
}
}
public class Context { private string statement; private int data; public Context(string statement) { this.statement=statement; } public string Statement { get { return statement; } set { statement = value; } } public int Data { get { return data; } set { data = value; } } }
}
