my$reference=\$variable; 对$scalar的解引用: $$reference; 对@array的引用: my@array; my$reference=\@array; 对@array的解引用: $$reference[element]; $reference->[element]; @$reference; #to access the whole array 对%hash的引用 my%hash; my$reference=\%hash; 对%hash的解引用: $$reference...
GNU General Public License, which may be foundinthe Perl5source kit. Complete documentationforPerl, including FAQ lists, should be foundonthissystemusing"man perl"or"perldoc perl". If you have access to the Internet, point your browser at http://www.perl.org/, the Perl Home Page.12345678 ...
#!/usr/bin/perl # Function definition sub PrintHash { my (%hash) = @_; foreach $item (%hash) { print "Item : $item\n"; } } %hash = ('name' => 'Tom', 'age' => 19); # Create a reference to above function. $cref = \&PrintHash; # Function call using reference. &$cr...
Hello World 4.引用reference perl的引用本质上是一个标量型变量,负责保存另一个变量的地址。在创建引用时,需要使用反斜杠符号。 [root@dou shili]# cat 4.pl #!/usr/bin/perl -w use strict; #create variables my $age = 18; my @array = qw(hello world come on); my %home = ( owner => "m...
my @colours= ("Red", "Orange", "Yellow", "Green", "Blue");my $arrayRef= \@colours;print $colours[0]; # direct array accessprint ${ $arrayRef }[0]; # use the reference to get to the arrayprint $arrayRef->[0]; # exactly the same thingmy %atomicWeights= ("Hydrogen" =>1.00...
Reference type in r : SCALAR Reference type in r : ARRAY Reference type in r : HASH 1234 循环参考 当两个引用包含对彼此的引用时,将发生循环引用。 创建引用时必须小心,否则循环引用可能会导致内存泄漏。 以下是一个例子 - #!/usr/bin/perl my $foo = 100; $foo = \$foo; print "Value of foo...
print "The last populated index is ".$#array; # "The last populated index is 5" perl脚本的参数包含在内建变量@ARGV中 [oracle@dwh1 ~]$ cat 4.pl if ($#ARGV <0){ print "请输入一个表名参数"; print "\$#ARGV is $#ARGV\n"; ...
(The multidimensional syntax described later can be used to access this. For example, after the above, "$arrayref->[2][1]" would have the value "b".) Taking a reference to an enumerated list is not the same as using square brackets--instead it's the same as creating a list of ...
The string might be localized. It might be an Exception::Class object, or a Throwable object, or a simple array reference. Or any other value a Perl scalar can hold. This lack of specificity requires careful handling of exceptions:if (my $err = $@) { if (ref $err) { ...
(Joshua ben Jore) "B" It's now possible to access the lexical pragma hints ("%^H") by using the method B::COP::hints_hash(). It returns a "B::RHE" object, which in turn can be used to get a hash reference via the method B::RHE::HASH(). (Joshua ben Jore) "Thread" As...