同其他大多數編程語言一樣,Perl中的單行注釋也是#開頭,例如:
#print "Hello,World!";
但多行注釋,不同的語言有不同的注釋方式,比如說:
Java,C/C++:
/* *注釋若干行 *注釋若干行 *注釋若干行*/
Python:
""" 用三個雙引號,多行注釋 用三個雙引號,多行注釋 用三個雙引號,多行注釋
Ruby:
=
begin
This
is a comment.
This
is a comment, too.
This
is a comment, too.
=
end
Shell:
#
This is a comment.
#
This is a comment, too.
#
This is a comment, too.
Perl: 多行注釋為:
=說明:第一個等號必須緊跟一個字符!
比如說:
#! C:\Perl\bin\perl -w use strict; use warnings; use String::Util ':all'; use 5.016; =my $element = " abc "; printf "<%s>\n", trim($element); printf "<%s>\n", trim($element, right => 0); printf "<%s>\n", trim($element, left => 0); =cut