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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/