Characters are represented inside the machine as small integers using a character code. ASCII (American Standard Code for Information Interchange) is the most commonly used character code.
The character type in Lisp is used to represent and manipulate characters in a way that does not depend upon the particular code that is used.
Character constants are written using the prefix #\ :
#\a #\A #\( #\space #\newline
(char? obj) tests whether obj is a character.
These predicates test whether characters are in the specified classes. The class whitespace includes the characters space, tab, and newline.
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