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PROGRAMMING-THE-WEB-10CS73-->View question

Explain the fundamentals of arrays in perl.

Asked (05 Marks) (Jun/July -2015)

Asked On2017-05-15 17:03:05 by:Rajiv

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An array stores an ordered list of values. While a scalar variable can only store one value, an array can store many. Perl array names are prefixed with an @-sign. Here is an example: my @colors = ("red","green","blue");

Each individual item (or element) of an array may be referred to by its index number. Array indices start with 0, so to access the first element of the array


you use $colors[0].

Notice that when you're referring to a single element of an array, you prefix the name with $ instead of @. The $-sign again indicates that it's a single (scalar) value; the @-sign means you're talking about the entire array. If you want to loop through an array, printing out all of the values, you could print each element one at a time:

my @colors = ("red","green","blue");

print "$colors[0]\n"; # prints "red" print "$colors[1]\n";

# prints "green" print "$colors[2]\n";

# prints "blue" A much easier way to do this is to use a foreach loop:

my @colors = ("red","green","blue");

foreach my $i (@colors) { print "$i\n"; }

For each iteration of the foreach loop,

$i is set to an element of the @colors array. In this example,

$i is "red" the first time through the loop.

The braces {} define where the loop begins and ends, so for any code appearing between the braces,

$i is set to the current loop iterator.

Answerd on:2015-11-22 Answerd By:Rajiv

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