Answer Posted / prabhath kota

As friends said above, its otherwise called as associative
array. It has lot of advantages over perl.

Here we can keep the values in a structured way, that
structured way comes from key-value pairs.

Eg: (The syntax given above are also correct, but the below
representation is much better in look and feel)

my %hash_example = ( a => 10,
b => 20,
c => 30 );
keys : a,b,c
values : 10,20,30

Features of Hash :
##################
1) Keys should always be unique where as values may not be
unique

(Right)
my %hash_example = ( a => 10,
b => 10,
c => 10 );

(wrong)
my %hash_example = ( a => 10,
a => 20,
a => 30 );

2) keys (%hash_example) will return an array containing only
keys

my @keys = keys(%hash);

3) similary for values
my @values = keys(%values);

package MYCALC; use Exporter; our @EXPORT = (); our @ISA = qw(Exporter); our @EXPORT_OK = qw(addition multi); our %EXPORT_TAGS = (DEFAULT => [qw(&addition)],Both => [qw(&addition & +multi)]); sub addition { return $_[0] + $_[1]; } sub multi { return $_[0] * $_[1]; } 1; Program: use strict; use warnings; my @list = qw (2 2); use Module qw(:DEFAULT); print addition(@list),"\n"; Above coding is my module MYCALC and the program which using this module, I have not exported any function using @EXPORT, but I have used the DEFAULT in %EXPORT_TAGS with the function addition, when I call this function from the main it says the error as,

2622

---

What does delete function do in perl?

929

---

How will you create a file in perl?

918

---

How to implement a stack in Perl?

954

---

Explain a tell function in perl?

918

---

What are the steps involved when the cgi program starts running?

859

---

How do I generate a list of all .html files in a directory?

900

---

What are the logical operators used for small scale operations?

907

---

How to close a directory in perl?

872

---

Is perl a case sensitive language?

1052

---

What is the importance of perl warnings? How do you turn them on?

992

---

List the data types that Perl can handle?

968

---

Comment on the scope of variables in perl.

883

---

What are the logical operators used for small scale operations? Explain them briefly.

924

---

How to compare two strings in perl?

890

---