字符串的逆序

1,老题目了,给个自己的版本.

#include <iostream>
#include <cstring>
using namespace std;

void Reverse(char* b, char* e)
{
    if ((b == NULL) || (e == NULL))
        return ;
    while (b < e)
    {
        *b ^= *e;
        *e ^= *b;
        *b ^= *e;
        ++b;
        --e;
    }
}

void WordReverse(char* s)
{
    if (s == NULL)
        return;
    Reverse(s, s + strlen(s) - 1);
    char* b = s;
    char* e = s;
    while(*e)
    {
        if (*e == ' ')
        {
            Reverse(b, e - 1);
            ++e;
            b = e;
        }
        else
            ++e;
    }
    Reverse(b, e - 1);
}

int main()
{
    char my[] = "I am a student";
    Reverse(my, my + strlen(my) - 1);
    cout << my << endl;
    char my2[] = "I am a student";
    WordReverse(my2);
    cout << my2 << endl;
    return 0;
}