disappearing spaces problem

From: Patrick Herring (ph_at_anweald.co.uk)
Date: 09/08/04 

Date: Wed, 08 Sep 2004 12:20:47 GMT

Here's a problem I'm having in SWI but have also had with LPA (DOS)
and Sicstus and have never understood let alone solved:

If I do op( 0500, yfy, and).
then write( a and b )
gives a and b
but if I do op( 0500, yfy, & )
then write( a & b )
gives a&b
where the spaces either side of the & have gone. I also get this with
pseudo-random other user-defined ops.

I've always assumed it was down to operator precedence but the above
example shows that's not necessarily it. Any clues? 

-- 
Patrick Herring, Sheffield, UK
http://www.anweald.co.uk

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