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Perl Numbers

Number is a scalar type in perl programming. Number are used to perform mathematical operation. In perl programming there are main two types of numbers is generally used numeric value such as integers and floating point numbers. Generally numbers are used by decimal system which is can be form of positive and negative values.

use warnings;
use strict;

#Integer numeric value
my $age = 21; 

#Floating point numbers
my $salary = 89333.245; 

#Negative integer value
my $lose = -1000 ; 

print $age,"\n";

print $salary,"\n";

print $lose,"\n"; 

In this example all three variables such as $age , $salary and $lose are storing the numeric literal values.

Numeric literals

There are 4 ways to representing a number. Such as binary, octal, decimal and hexadecimal. In perl programming all those formats can be used.

Format Prefix Example
Binary 0b 0b1010, 0b11111
Octal 0 012, 014
Decimal -10,10
Hexadecimal 0x 0xA ,0xB
use warnings;
use strict;

#assign binary literals
my $binary = 0b1010;

#assign octal literals
my $octal = 012;

#assign decimal literals
my $decimal = 10;

#assign hexadecimal literals
my $hexadecimal = 0xA;

print $binary,"\n"; #10
print $octal,"\n"; #10
print $decimal,"\n"; #10
print $hexadecimal,"\n"; #10

Note that result is always in form of a decimal number system. Internally before initialize a value to variable according to prefix value are converted into a decimal.

Formatting Numeric literals

Generally number is separating by comma for separating a long numbers for example (9,48,5,20) is representing a number. But In programming language comma are not a part of number. So we can use (_) underscore to separating long number literals.

use warnings;
use strict;

my $population = 89_69_47_89;

my $salary = 9_48_5_20.87_5_10; 

print $population,"\n";
print $salary,"\n";

Note that number formatting are used to provide readability of programmer internally perl number are not use underscore.


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