gforth: gforth/fib.fs

documented S>NUMBER? S>UNUMBER?
minor changes

\ Note: This is incorrect ("n fib" produces the result for fib(n+1)),
\ but we do not change it to ensure that future timing results are
\ comparable to older timing results.

: fib ( n1 -- n2 )
    dup 2 < if
	drop 1
    else
	dup
	1- recurse
	swap 2 - recurse
	+
    then ;

: main 34 fib drop ;

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