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| ANSI Common Lisp 13 Characters 13.2 Dictionary of Characters
13.2.10 digit-char | Function
  Syntax: digit-char weight `&optional` radix char Arguments and Values: weight - a non-negative integer. radix - a radix. The default is `10`. char - a character or false. Description: If weight is less than radix, digit-char returns a character which has that weight when considered as a digit in the specified radix. If the resulting character is to be an alphabetic1 character, it will be an uppercase character. If weight is greater than or equal to radix, digit-char returns false. Examples:
       (digit-char 0)  #\0
       (digit-char 10 11)  #\A
       (digit-char 10 10)  false
       (digit-char 7)  #\7
       (digit-char 12)  false
       (digit-char 12 16)  #\C  ;not #\c
       (digit-char 6 2)  false
       (digit-char 1 2)  #\1
See Also: digit-char-p, graphic-char-p, Section 2.1 Character Syntax Notes: Allegro CL Implementation Details: None.

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