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Re: Change in printing of Scheme values


BLewis wrote:
If chars get treated the way strings are, it won't break existing code
that I know of.  But (display 2) (display #\:) (display 3) would break.

That works as you presumably want:


#|kawa:1|# (display 2) (display #\:) (display 3)
2:3

Here's a situation where you might want to jam numbers together: check
digits.  We actually deal with a vendor who always sends six-digit SEDOL
numbers, omitting the seventh check digit.  Code that displays the valid
seven-digit SEDOL might display two numbers jammed together.  I'm sure
there are other situations where code might display a base number jammed
together with its check digit(s).

For something like that you really should be using format. Can the SEDOL number start with a 0? In that case you can't use display anyway. Some formats have two check digits. (For example Norwegian "person numbers" - like social security numbers.) If the first one can be zero, then you can't write the check digits using display, since then you'd only get a single check digit. -- --Per Bothner per@bothner.com http://per.bothner.com/


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