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
This is an example OPAL program, which calculates the GCD recursively.
Signature file:
SIGNATURE GCD FUN GCD: nat ** nat -> nat
Implementation file:
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
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