Accessing variables in subroutines : Subroutine Definition « Subroutine « Perl






  1. Perl
  2. Subroutine
  3. Subroutine Definition

Accessing variables in subroutines

   

# In your subroutines, you can access the value of any global variable.
# A global variable is a variable that is accessible across the entire Perl script. 
        
# A subroutine can use data set up by other parts of your Perl scripts:

#!/usr/bin/perl -w

# Accessing global variables in subroutines.
$a = 1;
$b = 4;

$value = add();

print "$a plus $b is $value.\n";

sub add {
    return ($a + $b);
}

# sub3.pl








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6.Define subroutine prototype
7.Define subroutine then use it
8.Subroutine with arguments defined before it is used
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10.Subroutine with no arguments defined before it is used
11.Anonymous Subroutines
12.Anonymous functions