Problem Statement

List the conditional structures offered by a programming language. See Wikipedia: conditionals for descriptions. Common conditional structures include if-then-else and switch. Less common are arithmetic if, ternary operator and Hash-based conditionals. Arithmetic if allows tight control over computed gotos, which optimizers have a hard time to figure out.

Let's start with the solution:

 )
      (<==? .X 2> )
      (T )>

;"Negate X if its value is less than 0"
 >>

;"Print a message unless the quiet flag is set"
>