SHOW SCREEN SHOTS OF THE INPUT AND OUTPUT AS WELL AS THERESULTS

PROGRAMMING IN PERL

Task 2: Variables

2.1 Scalar Variables

A scalar is a single unit of data. That data might be an integernumber, floating point, a character, a string, a paragraph, or anentire web page. Simply saying it could be anything, but only asingle thing.

#!/usr/bin/perl

$age = 35; # An integer assignment

$name = \"Gary Mann\"; # A string

$salary = 5445.50; # A floating point

print \"Age = $age\n\";

print \"Name = $name\n\";

print \"Salary = $salary\n\";

Output__________________

2.2 Array Variables

An array is a variable that stores an ordered list of scalarvalues. Array variables are preceded by an \"at\" (@) sign. To referto a single element of an array, you will use the dollar sign ($)with the variable name followed by the index of the element insquare brackets.

#!/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\";

Output______________________

2.3 Hash Variables

A hash is a set of key/value pairs. Hash variables are precededby a percent (%) sign. To refer to a single element of a hash, youwill use the hash variable name followed by the \"key\" associatedwith the value in curly brackets.

#!/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\";