You can combine operators such as +, -, and * with the assignment operator : Arithmetic Operators « Language Basics « Perl

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Perl » Language Basics » Arithmetic Operators 
You can combine operators such as +, -, and * with the assignment operator
   

$x += 2;
$x -= 2;
$x *= 5;

   
    
    
  
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2.Adding a number and a string
3.Power with **
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5.Float power
6.Left shift
7.After incrementing
8.After pre-increment: ++$a * 2
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10.Using auto-increment operator for a string with digits
11.Using auto-increment operator for a string
12.A program that uses the pre-increment operation.
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14.Operators demo: Arithmetic Operators
15.Precedence and Associativity
16.Add 3 to $var; same as $var=$var+3
17.Subtract 1 from $var
18.Square $var
19.Modulus operator
20.Arithmetic Operators in action
21.Autoincrement and Autodecrement Operators and Assignment
22.Numeric Operators
23.Use parentheses wherever possible to force precedence.
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