Re: cl-quiz

Tel A. wrote:

A question in pertinance to the quiz:

How could one write a format directive something to the effect of

;wrong
(format nil "~r ~a~:p" 10 "apricot")
=> "10 apricots"

(format nil "~r ~a~:p" 1 "apricot")
=> "1 apricot"

I would like it to take two arguments, print the first one as a real
then print the second one, a string, with correct pluralization as per
the first argument.

Anyone done this before?


There's so much magic in FORMAT that it takes a while to get familiar with it all:
http://www.lispworks.com/documentation/HyperSpec/Body/22_cga.htm

You can use ~n:* to back up n arguments, with 1 the default:
(format nil "~r ~a~:*~:p" 10 "apricot") => "ten apricots"

But based on your description you probably want ~D rather than ~R:
(format nil "~d ~a~:*~:p" 1 "apricot") => "1 apricot"

Unless you actually meant "float" when you wrote "real":
(format nil "~f ~a~:*~:p" 1 "apricot") => "1.0 apricot"

(Remember that you're not really "printing" anything when you use NIL as the first argument to FORMAT.)

Aloha,
David Sletten
.

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