This just means hexadecimal notation, which we'll come back to before long so really it just means it's returning the 0 address zero.

这表示的是16进制,我们等下还会讨论，表示的是返回,地址。

哈佛公开课 - 计算机科学课程节选

Welcome back for those returning, welcome to CS50 for those joining us for the first time.

欢迎老同学，也欢迎新同学。

哈佛公开课 - 计算机科学课程节选