經典的字符串操作的題目，左旋轉，反序輸出所有的單詞

#include <Windows.h> 
#include <iostream.h>

TCHAR *  ReverseStr(TCHAR * src,int n)//將字符串的前n個字符翻轉
{
	int len = strlen(src);
	if(src == NULL ||  n < 1)
		return NULL;

	n = (n > len ? len : n);	
	int m = n / 2;
	TCHAR Tmp;
	for(int i = 0 ; i < m ; i++ ,n--)
	{
		Tmp = src[i];
		src[i] = src[n-1] ;
		src[n-1] = Tmp;
	}
	return src;
}

char* LeftRotateStr(char * src,int n) //將字符串的前n個字符原序放到最後
{
	int len = strlen(src);
	if(src == NULL || n < 1 || len < n)
		return NULL;

	ReverseStr(src,n);

	ReverseStr(&src[n],len - n);	
	
	ReverseStr(src,len);
	
	return src;
}


char * RotateSentence(char *src)//反序輸出所有的單詞，比如 “I love this game”輸出爲“game this love I”。經典的面試題
{
	int len = strlen(src);
	if(src == NULL || len < 1)  return NULL;
	
	int wordlen = 0;
	int i=0 , j = 0;
	for( i = 0; i <= len ; i++)
	{	
		if(src[i] == ' ' || src[i] == '\0')
		{
			ReverseStr(&src[j],wordlen);
			j = i + 1;			
			wordlen = -1;
		}
		wordlen++;

	}
	ReverseStr(src,len);
	return src;
}

int  main() 
{
	char str[]="123456789";
	cout<<endl;

	cout<<str<<endl;
	ReverseStr(str,5);
	cout<<str<<endl;
	
	cout<<str<<endl;
	LeftRotateStr(str,8);
	cout<<str<<endl;

	char str2[]="I love the stupid game ";

	
	cout<<str2<<endl;
	RotateSentence(str2);
	cout<<str2<<endl;

}