Subject: Re: How do I convert from binary string to integer? From: Erik Naggum <email@example.com> Date: 1997/05/06 Newsgroups: comp.lang.lisp Message-ID: <firstname.lastname@example.org> * Carolyn Goodman Plampin | Given an arbitrary number of binary characters in a string, say "10000" | or "10010001" as examples, how do I convert this into an integer? just like you would turn any string of digits in any base to an integer. | Going from integer to string is easy via format ~b but going in the other | direction is not so obvious to me. (write <integer>) will output the integer as a string of digits in the base according to the value of the special varibale *print-base*. the corresponding special variable when reading is *read-base*. (let ((*print-base* 2)) (write 4711)) -> 1001001100111 => 4711 (setq *print-base* 2) => 10 4711 => 1001001100111 (setq *print-base* 10 *read-base* 2) => 2 1001001100111 => 4711 relevant functions are `read-from-string' and `parse-integer'. note that `write' and `parse-integer' take keyword arguments that obviate the need to bind the special variables yourself. #\Erik -- if we work harder, will obsolescence be farther ahead or closer?