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*To*: Aubrey Jaffer <agj@xxxxxxxxxxxx>*Subject*: Re: implementation categories, exact rationals*From*: Michael Sperber <sperber@xxxxxxxxxxxxxxxxxxxxxxxxxxx>*Date*: Sun, 16 Oct 2005 21:44:10 -1000*Cc*: srfi-77@xxxxxxxxxxxxxxxxx*Delivered-to*: srfi-77@xxxxxxxxxxxxxxxxx*In-reply-to*: <20051014181146.599D01B77BB@xxxxxxxxxxxxxxxxxxxxx> (Aubrey Jaffer's message of "Fri, 14 Oct 2005 14:11:46 -0400 (EDT)")*References*: <20051014181146.599D01B77BB@xxxxxxxxxxxxxxxxxxxxx>*User-agent*: Gnus/5.110003 (No Gnus v0.3) XEmacs/21.5-b21 (darwin)

Aubrey Jaffer <agj@xxxxxxxxxxxx> writes: > What is the rationale for mandating exact rationals? This (from the SRFI document): > Under R5RS, it is hard to write programs whose arithmetic is > portable across the above categories, and it is unnecessarily > difficult even to write programs whose arithmetic is portable > between different implementations in the same category. > The portability problems can most easily be solved by requiring all > implementations to support the full numeric tower. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla

**Follow-Ups**:**Re: implementation categories, exact rationals***From:*Aubrey Jaffer

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