RosettaCodeData/Task/Anonymous-recursion/FBSL/anonymous-recursion.fbsl

#APPTYPE CONSOLE

FUNCTION Fibonacci(n)
	IF n < 0 THEN
		RETURN "Nuts!"
	ELSE
		RETURN Fib(n)
	END IF
	FUNCTION Fib(m)
		IF m < 2 THEN
			Fib = m
		ELSE
			Fib = Fib(m - 1) + Fib(m - 2)
		END IF
	END FUNCTION
END FUNCTION

PRINT Fibonacci(-1.5)
PRINT Fibonacci(1.5)
PRINT Fibonacci(13.666)

PAUSE