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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

@colors,

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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