Statements

                    CHAPTER 5: STATEMENTS


   Expression

     - Any construction that can be used where a value is required

     - Typically composed of literals, variables, operators, functions 
       and subroutine calls

     - Only two types of expressions: scalar and list


   Statement

     - Simple

     - Compound


   Simple Statement

     - Expression optionally followed by a modifier

     - Terminated with a semicolon


   Compound Statement

     - Statement built out of expressions and statement blocks


   Statement Block

     - Sequence of statements enclosed in matching curly braces, {}

     - Accepted anywhere a simple statement is allowed

   
   Simple Statements

     - EXPR

     - EXPR_1 if EXPR_2

     - EXPR_1 unless EXPR_2

     - EXPR_1 while EXPR_2

     - EXPR_1 until EXPR_2

     - EXPR_1 ? EXPR_2 : EXPR_3

     - EXPR_1 && EXPR_2

     - EXPR_1 || EXPR_2

     - do BLOCK [while EXPR]

     - do BLOCK [until EXPR]

     - Note that the last two are considered simple statements even 
       though they contain statement blocks


   Compound Statements

     - if (EXPR_1) BLOCK [ [ elsif (EXPR_2) BLOCK...] else BLOCK ]
 
     - unless (EXPR_1) BLOCK [ else BLOCK ]

     - [LABEL:] while (EXPR) BLOCK [ continue BLOCK ]

     - [LABEL:] until (EXPR) BLOCK [ continue BLOCK ]

     - [LABEL:] for (EXPR_1; EXPR_2; EXPR_3) BLOCK

     - [LABEL:] foreach VAR (ARRAY) BLOCK

     - [LABEL:] BLOCK [ continue BLOCK ]