Search forw/backw r Return from subroutine M Show module versions c [ln|sub] Continue until position Debugger controls: L List break/watch/actions o [...] Set debugger options t [expr] Toggle trace [trace expr]
子程序(Subroutine)是 Perl 语言中实现代码重用和结构化编程的基本单元。通过定义和调用子程序,可以将复杂的任务分解成多个可管理的小部分,从而提高代码的清晰度和可维护性。 语法: sub 函数名{ 代码语句; ... 代码语句; } Perl中的子程序中可以定义、引用、修改全局变量,也可以用my定义局部变量。 一般情况下...
package MySubClass; @ISA = qw( MyClass ); sub new { print "MySubClass::new called\n"; my $type = shift; # The package/type name my $self = MyClass->new; # Reference to empty hash return bless $self, $type; } sub DESTROY { print "MySubClass::DESTROY called\n"; } sub MyMe...
Arrays Hashes 因此,我们将在Perl中使用三种类型的变量。scalar变量将以美元符号($)开头,它可以存储数字,字符串或引用。array变量将以符号@开头,它将存储有序的标量列表。 最后,Hash变量将以符号%开头,并将用于存储键/值对的集合。 Perl将每个变量类型保存在单独的命名空间中。 因此,您可以在不担心冲突的情况下,...
Here is a Perl subroutine,Adder, that takes 2 integer parameters and simply returns their sum. sub Adder { my($a, $b) = @_; $a + $b; } Because we are now concerned with the return value fromAdder, the C function required to call it is now a bit more complex. ...
To continue executing until subroutine foo is called DB<1>c foo To execute the next statement DB<1> n To step into any subroutine call that's part of the next statement DB<1> s To run until the current subroutine returns DB<1> r ...
perl 如何将分支子程序的散列内容传递回主程序？所有这一切的主要问题是：在您的三级层次结构的哪一部分...
Perl的变量有三种类型:标量(scalar),数组(array)和哈希(hash)。每种类型有它自己的记号,分别是￥,@和%。变量用my声明,保存到封闭的块(enclosing block)或者文件(file)的结尾。 标量变量 ·标量变量可以储存: ·undef(和Nonein Python,nullin PHP一致) ...
The interaction with the Perl compilation happens inside package "myint": package myint; use strict; use warnings; sub import { $^H{myint} = 1; } sub unimport { $^H{myint} = 0; } sub in_effect { my $level = shift // 0; my $hinthash = (caller($level))[10]; return $hint...
Simple example of subroutine Lets take a simple example to understand this: #!/usr/bin/perlmy$msg;# defining three subroutinessubask_user{printf"Please enter something: ";}subget_input{$msg=<STDIN>;return$msg;}subshow_message{printf"You entered: $msg";}#calling subroutines&ask_user;&get_...