字符串的就地逆置

steven-zhou

/* 非递归实现 */void reverse(char *s){    char *head;    char *tail;    char tmp;    head = s;    tail = head + strlen(s) - 1;    while (head < tail) {        tmp = *head;        *head = *tail;        *tail = tmp;        head++;        tail--;    }}
/* 递归实现 */void reverse(char *str, int len){    if (len <= 1)        return;    char *end = str + len - 1;    char tmp;    tmp = *str;    *str = *end;    *end = tmp;    reverse(str + 1, len - 2);}