编程练习-自己写一个strcpy

char *strcpy_(char *strDest, const char *strSrc)
{
    // Error
    if(strSrc == NULL)
        return NULL;

    const char* p = strSrc;//const在?*号左边，指针可以变，所指物不能变！
    char* q = strDest;

    p = strSrc;
    q = strDest;
    while(*p != '\0')
        *q++ = *p++;
    *q = '\0';

    return strDest;
}

//标准答案，简洁明快！

char * __cdecl strcpy__(char * dst, const char * src) {
    char * cp = dst;
    while( *cp++ = *src++ ) ; /* Copy src over dst */
    return( dst );
}