39 lines
1.5 KiB
Factor
39 lines
1.5 KiB
Factor
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! :folding=indent:collapseFolds=0:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: math
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USE: combinators
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USE: kernel
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USE: stack
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: (gcd) ( x y -- z )
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dup 0 = [ drop ] [ tuck mod (gcd) ] ifte ;
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: gcd ( x y -- z )
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#! Greatest common divisor.
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abs swap abs 2dup < [ swap ] when (gcd) ;
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