学会指针看完这篇即可

https://mp.weixin.qq.com/s?src=11&timestamp=1639620052&ver=3499&signature=Z1PQTvhwEnrHBdzSCGJIQNEz-zKRTioorNA4KI7qsS1lvAfH6Z7sKjZCZU8KG9DUVOvDrYhjmSul*Dg98cexVSgZgxSsvZlWB-x3o4sUTzYwnOq9kvn3GDFpx1qfRWaN&new=1
这个人讲得真的非常的详尽！！