以下是引用TonyDeng在2012-2-18 11:29:44的发言：

關於複雜度，給你舉一個例子，看如下兩個版本的代碼：

 
void * memchr(void * pv, unsigned char ch, size_t size)
{
    unsigned char * pch = (unsigned char * )pv;
    unsigned char * pchEnd = pch + size;
    while (pch < pchEnd && *pch != ch) pch++;
    return ((pch < pchEnd) ? pch : NULL);
}


 
void * memchr(void * pv, unsigned char ch, size_t size)
{
    unsigned char * pch = (unsigned char * )pv;
    unsigned char * pchEnd = pch + size;
    while (pch < pchEnd)
    {
        if (*pch == ch) return (pch);
        pch++;
    }
    return (NULL);
}


你覺得哪個較好？