( Fibonacci: Numbers made of the two numbers before it )

|0100

@on-reset
	#0019 #0001
	&l ( -- )
		( index ) DUP2 pdec #2018 DEO
		( recursive ) DUP2 fib pdec #2018 DEO
		( tail-recursive ) DUP2 #0000 #0001 ROT2 fibr pdec
		( lb ) #0a18 DEO
		POP2 POP2 INC2 GTH2k ?&l
	POP2 POP2
	( end ) #800f DEO
	BRK

(
@|recursive )

@fib ( num* -- numfib* )
	#0001 GTH2k ?&>ok
		POP2 JMP2r &>ok
	( a ) SUB2k fib STH2
	( b ) INC2 SUB2 fib STH2r
	( res ) ADD2 JMP2r

(
@|tail-recursive )

@fibr ( a* b* num* -- a* b* numfib* )
	DUP2 #0001 NEQ2 ?&>no-1
		POP2 DUP2 JMP2r &>no-1
	( a ) #0001 SUB2 STH2
	( b ) SWP2 ADD2k NIP2 STH2r !fibr

(
@|stdlib )

@pdec ( short* -- )
	#2710 LIT2r 00fb
	&w ( -- )
		DIV2k #000a DIV2k MUL2 SUB2 SWPr EQUk OVR STHkr EQU AND ?&>skip
			DUP LIT "0 ADD #18 DEO
			INCr &>skip
		POP2 #000a DIV2 SWPr INCr STHkr ?&w
	POP2r POP2 POP2 JMP2r