The undef values in Perl

发布时间：2020-12-16 00:05:09 所属栏目：大数据来源：网络整理

导读：Varibels have the special undef value before they are first assigned,which is Perl's way of saying " nothing here to look at -- move alog,move alog." If you use this "nothing" as a "numric something",it will act like zero; if you use this

Varibels have the special undef value before they are first assigned,which is Perl's way of saying " nothing here to look at -- move alog,move alog."

If you use this "nothing" as a "numric something",it will act like zero;

if you use this "nothing" as a "string something",it will act like nuil.

But it's better to definit the variables.

（编辑：李大同）

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