Re: Strings

From: Hannah Schroeter (hannah_at_schlund.de)
Date: 01/14/04 

Date: 14 Jan 2004 20:45:47 GMT

Hello!

Kristof <kristof_jebens@hotmail.com> wrote:

>Can anyone tell me how to convert e.g. a list into a string like the
>print function in lisp does?

There are functions print-to-string, prin1-to-string and
princ-to-string. Or you can use string output streams. In this case,
you can format to the string stream or build the output with multiple
output function calls.

(with-output-to-string (stream)
  (format stream "Hello world! ")
  (princ '(1 2 3) stream))

 =>
"Hello world! (1 2 3)"

>Is there a way to add characters/strings to a string?

It depends. In principle strings are one-dimensional arrays
containing characters. Arrays can be adjustable or not
(i.e. you can change the size of the dimensions), and
have a fill-pointer (a concept that only a part of a one-dimensional
array is really "valid").

So if the string is adjustable, you can destructively append to it
(change the original string).

You can, of course, also do it in a functional way, creating a
new string which is the concatenation of two or more old ones,
using (concatenate 'string a-string another-string)

>Thank you
>Kristof

Kind regards,

Hannah.

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