在第 4 行 ex1.pl 处调用了未定义的子例程 &main::add
Undefined subroutine &main::add called at ex1.pl line 4
我有一个 perl 模块
MyMathLib.pm
package MyMathLib;
require Exporter;
@ISA = qw/EXPORTER/;
@EXPORT = qw/add/;
sub add
{
$_[0] + $_[1];
}
1;
Ex1.pl
#!usr/bin/perl
#
use MyMathLib;
print add(1,2);
我收到以下错误:
Undefined subroutine &main::add called at ex1.pl line 4.
可能是什么原因?
它是出口商而不是出口商。
如果你包括
use strict;
use warnings;
在您的脚本中,您将激活 more checks 这会向您显示问题的线索:
Can't locate package EXPORTER for @MyMathLib::ISA at Ex1.pl line 5.
Undefined subroutine &main::add called at Ex1.pl line 6.
我有一个 perl 模块
MyMathLib.pm
package MyMathLib;
require Exporter;
@ISA = qw/EXPORTER/;
@EXPORT = qw/add/;
sub add
{
$_[0] + $_[1];
}
1;
Ex1.pl
#!usr/bin/perl
#
use MyMathLib;
print add(1,2);
我收到以下错误:
Undefined subroutine &main::add called at ex1.pl line 4.
可能是什么原因?
它是出口商而不是出口商。
如果你包括
use strict;
use warnings;
在您的脚本中,您将激活 more checks 这会向您显示问题的线索:
Can't locate package EXPORTER for @MyMathLib::ISA at Ex1.pl line 5.
Undefined subroutine &main::add called at Ex1.pl line 6.