韩半仙

摘要： a reference is a variable that refer to a value- as opposed to a variable that contains a valueexample.pl#!/usr/bin/perl#usestrict;usewarnings;main(@ARGV);submain{my$var="ThisisthePerl5referenceschapter.";my$ref=\$var;my$copy=$ref;message($$ref);$var=42;message($$copy);}submessage{my$m=shi 阅读全文

摘要： understanding subroutinessubroutines(sometimes called "functions") are a means of encapsulating code.subroutines are reusable. subroutines can hide complexity.subroutines can call other subroutines.subroutines can call themselves.this is called "recursion"http://www.cnblogs.com/h 阅读全文