Opal (programming language) explained

OPAL (OPtimized Applicative Language) is a functional programming language first developed at Technische Universität Berlin.

There is a later framework for static code analysis also called Opal.^[1]

Example program

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

References

External links

• The OPAL Home Page, archived, last modified 30 September 2010.
• OPAL Installation Guide, archived.

Notes and References

1. Web site: OPAL Project. Home page. 25 November 2023.