I want to print all the occurrence of @cg in @gl and for the corresponding index of matched @gl, i want to print @csta

Sounds like a perfect job for hashes, especially if your inputs are non-trivially large. Given @gl and @csta are of equal length, List::MoreUtils will work nicely:

#!/usr/bin/env perl

use 5.012;
use warnings FATAL => 'all';

use List::MoreUtils qw/zip/;

my @cg   = (qw<one two three four five>);
my @gl   = (qw<two four five>);
my @csta = (qw<II  IV   V>);

my %gl_csta = (zip @gl, @csta);

printf "%5s => %s\n", $_, $gl_csta{$_} 
    for grep { exists $gl_csta{$_} } @cg;

[download]

Output:

  two => II
 four => IV
 five => V

[download]

In reply to Re: how to refer the index of an array to another array of the same length by rjt
in thread how to refer the index of an array to another array of the same length by rocketperl

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