digit-char weight &optional radix → char

weight — a non-negative integer.

radix — a radix. The default is 10.

char — a character or false.

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.

(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

digit-char-p, graphic-char-p, Section 2.1 (Character Syntax)