public static StringDS Concat(StringDS s1, StringDS s2)//连接字符串
{
char[] newData = new char[s1.GetLength() + s2.GetLength()];
for (int i = 0; i < s1.GetLength(); i++)
{
newData[i] = s1[i];
}
for (int i = s1.GetLength(); i < newData.Length; i++)
{
newData[i] = s2[i - s1.GetLength()];
}
return(new StringDS(newData));
}
/// <summary>
/// 字符串比较
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public int Compare(StringDS s)
{
int len = this.GetLength() < s.GetLength() ? this.GetLength() : s.GetLength(); //取得两个字符串中，长度更小的字符串长度
int index = -1; //存储不相等的字符的索引位置
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);
}
}
}
}
static void Main(string[] args)
{
StringDS s = new StringDS("I am a teacher");
StringDS i = new StringDS("excellent");
StringDS r = new StringDS("student");
Console.WriteLine(s.GetLength());
Console.WriteLine(i.GetLength());
Console.WriteLine(r.GetLength());
StringDS s2 = s.SubString(8, 4);
Console.WriteLine(s2.ToString());
StringDS i2 = i.SubString(2, 1);
Console.WriteLine(i2.ToString());
Console.WriteLine(s.IndexOf(new StringDS("tea")));
Console.WriteLine(i.IndexOf(new StringDS("cell")));
Console.ReadKey();
}
public int IndexOf(StringDS s)
{
for (int i = 0; i <= this.GetLength() - s.GetLength(); i++)
{
bool isEqual = true;
for (int j = i; j < i + s.GetLength(); j++)
{
if (this[j] != s[j - i])
{
isEqual = false;
}
}
if (isEqual)
{
return(i);
}
else
{
continue;
}
}
return(-1);
}
