From: Esen Alici
Subject: Question
Date: Sat, 13 Mar 1999 00:00:00 +0000
Message-ID: <7cccl1$9a0@bgtnsc01.worldnet.att.net>

What is wrong with expressions like :    (+fraction (cons 1 2) (cons 3 4))

• Re: Question Barry Margolin
• Re: Question Kent M Pitman

From: Barry Margolin
Subject: Re: Question
Date: Sat, 13 Mar 1999 00:00:00 +0000
Message-ID: <UhjG2.205$p4.22531@burlma1-snr2>

In article <··········@bgtnsc01.worldnet.att.net>,
Esen Alici <·····@worldnet.att.net> wrote:
>What is wrong with expressions like :    (+fraction (cons 1 2) (cons 3 4))

There's nothing syntactically wrong with it.  Whether it makes sense
depends on what the +FRACTION function does when passed two conses as
parameters.

-- 
Barry Margolin, ······@bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.

From: Kent M Pitman
Subject: Re: Question
Date: Sat, 13 Mar 1999 00:00:00 +0000
Message-ID: <sfw3e3adp88.fsf@world.std.com>

"Esen Alici" <·····@worldnet.att.net> writes:

> What is wrong with expressions like :    (+fraction (cons 1 2) (cons 3 4))

As long as you define +fraction, nothing seems wrong.

Though you might want to try just

 (+ 1/2 3/4)

since rational numbers are a built-in datatype that the built-in + function
understands.