WeiBlog

using System;
using System.Collections.Generic;
using System.Text;

namespace 串
{
class StringDS
{
private char[] date;
public StringDS(char[] array )
{
date = new char[array.Length];
for (int i = 0; i < date.Length; i++)
{
date[i] = array[i];
}
}
public StringDS(string str)
{
date = new char[str.Length];
for (int i = 0; i < date.Length; i++)
{
date[i] = str[i];
}
}

    //索引器
    public char this[int index]
    {
        get { return date[index]; }
    }

    public int GetLength()
    {
        return date.Length;
    }

    /// <summary>
    /// 如果两字符相同返回0
    /// 如果当前字符小于s,返回-1
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public int Compare(StringDS s)
    {
        //取得长度较小的字符串长度
        int len = this.GetLength() < s.GetLength() ? this.GetLength() : s.GetLength();
        int index = -1;
        for (int i = 0; i < len; i++)
        {
            if (this[i]!=s[i])
            {
                index = i;
                break;
            }
        }
        if(index !=-1)
        {
            if (this[index ] > s[index ])
                return 1;
            else
                return -1;
        }else
        {
            if (this.GetLength()==s.GetLength ())
            {
                return 0;
            }else
            {
                if (this.GetLength() > s.GetLength())
                    return 1;
                else
                    return -1;
            }
        }
    }
    /// <summary>
    /// 截取字符串
    /// </summary>
    /// <param name="index"></param>
    /// <param name="length"></param>
    /// <returns></returns>
    public StringDS SubString(int index,int length)
    {
        char[] newDate = new char[length];
        for (int i = 0; i < length; i++)
        {
            newDate[i] = date[i+index ];
        }
        return new StringDS ( newDate);
    }
    public override string ToString()
    {
        /*string s="";
        foreach (char  item in date)
        {
            s += item;
        }
        return s;*/
        return new string(date);
        
    }
    public static StringDS Concat(StringDS a,StringDS b)
    {
        char [] newDate = new char[a.GetLength() + b.GetLength()];
        for (int i = 0; i < a.GetLength (); i++)
        {
            newDate[i] = a[i];
        }
        for (int i = a.GetLength (); i < newDate .Length; i++)
        {
            newDate[i] = b[i - a.GetLength()];
        }
        return new StringDS(newDate);
    }

    public int IndexOf(StringDS str)
    {
        for (int i = 0; i <= this .GetLength ()-str .GetLength (); i++)
        {
            bool isEqual = true;
            for (int j = i; j < i+str.GetLength (); j++)
            {
                if (this [j]!=str [j-i])
                {
                    isEqual = false;
                }
            }
            if (isEqual )
            {
                return i;
            }else
            {
                continue;
            }
        }
        return -1;
    }
}

}