/usr/lib/s9fes/help/char-to-integer is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | R4RS 6.6 (char->integer char) ==> integer
(integer->char integer) ==> char
Given a character, CHAR->INTEGER returns an integer representation
of the character. Given an integer that is the image of a character
under CHAR->INTEGER, INTEGER->CHAR returns that character. These
procedures implement injective order isomorphisms between the set
of characters under the CHAR<=? ordering and some subset of the
integers under the <= ordering. That is, if
(char<=? a b) ==> #t
and (<= x y) ==> #t
and X and Y are in the domain of INTEGER->CHAR, then
(<= (char->integer a)
(char->integer b)) ==> #t
and (char<=? (integer->char x)
(integer->char y)) ==> #t.
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