问题来自百度知道：
要求不要开辟另外的内存空间，我应该没做到。但至少效果实现了。
我的方法是：
static void Main(string[] args)
{
string sentence = "Recetly, hospitals in many";
Console.WriteLine(" 原来的句子：" + sentence);
Console.WriteLine("处理后的句子：" + ReverseSentence(sentence));
Console.Read();
}
static string ReverseSentence(string sentence)
{
char[] chars = sentence.ToCharArray();
sentence = "";
for (int i = chars.Length - 1; i >= 0; i--)
{
sentence += chars[i];
}
//Console.WriteLine(sentence);
Regex regex = new Regex(@"(\b\w+\b)|(\W+)");
MatchCollection matches = regex.Matches(sentence);
//Console.WriteLine(matches.Count);
string str = "";
for (int i = matches.Count - 1; i >= 0;i-- )
{
str += matches[i].ToString();
}
return str;
}
运行结果：
那个逗号的位置不对，下面是修改后的：
static void Main(string[] args)
{
string sentence = "Recetly, hospitals in many";
Console.WriteLine(" 原来的句子：" + sentence);
Console.WriteLine("处理后的句子：" + ReverseSentence(sentence));
Console.Read();
}
static string ReverseSentence(string sentence)//反转句子
{
sentence = ReverseString(sentence.Trim());
Regex regex = new Regex(@"(\b\w+\b)|(\W+)");
MatchCollection matches = regex.Matches(sentence);
string str = "";
for (int i = matches.Count - 1; i >= 0; i--)
{
if(i%2 == 0)
{
str += matches[i].ToString();
}
else
{
str += ReverseString(matches[i].ToString());
}
}
return str;
}
static string ReverseString(string str)//反转单个字符串
{
char[] chars = str.ToCharArray();
str = "";
for (int i = chars.Length - 1; i >= 0; i--)
{
str += chars[i];
}
return str;
}
运行结果：