Opal (programming language)

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OPAL (OPtimized Applicative Language) is a functional programming language first developed at the Technical University of Berlin.

Example program[edit]

This is an example OPAL program, which calculates the GCD recursively.

Signature file (declaration)
   SIGNATURE GCD
   FUN GCD: nat ** nat -> nat
Implementation file (definition)
   IMPLEMENTATION GCD
   IMPORT Nat COMPLETELY
   DEF GCD(a,b) == IF a % b = 0 THEN b
                       ELSE IF a-b < b THEN GCD(b,a-b)
                           ELSE GCD(a-b,b)
                       FI
                   FI

External links[edit]