PERL TUTORIALS - Perl Variables

Perl Variables

Variable Context

S.N.	Context and Description
1	Scalar: Assignment to a scalar variable evaluates the right-hand side in a scalar context.
2	List: Assignment to an array or a hash evaluates the right-hand side in a list context.
3	Boolean: Boolean context is simply any place where an expression is being evaluated to see whether it's true or false
4	Void: This context not only doesn't care what the return value is, it doesn't even want a return value.
5	Interpolative: This context only happens inside quotes, or things that work like quotes.

Creating Variables

$age = 25;             # An integer assignment
$name = "John Paul";   # A string 
$salary = 1445.50;     # A floating point

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						Scalar Variables

#!/usr/bin/perl

$age = 25;             # An integer assignment
$name = "John Paul";   # A string 
$salary = 1445.50;     # A floating point

print "Age = $age\n";
print "Name = $name\n";
print "Salary = $salary\n";

						Array Variables

#!/usr/bin/perl

@ages = (25, 30, 40);             
@names = ("John Paul", "Lisa", "Kumar");

print "\$ages[0] = $ages[0]\n";
print "\$ages[1] = $ages[1]\n";
print "\$ages[2] = $ages[2]\n";
print "\$names[0] = $names[0]\n";
print "\$names[1] = $names[1]\n";
print "\$names[2] = $names[2]\n";

						Hash Variables

#!/usr/bin/perl

%data = ('John Paul', 45, 'Lisa', 30, 'Kumar', 40);

print "\$data{'John Paul'} = $data{'John Paul'}\n";
print "\$data{'Lisa'} = $data{'Lisa'}\n";
print "\$data{'Kumar'} = $data{'Kumar'}\n";

						Variable Context

#!/usr/bin/perl

@names = ('John Paul', 'Lisa', 'Kumar');

@copy = @names;
$size = @names;

print "Given names are : @copy\n";
print "Number of names are : $size\n";