The following table gives the list of allowed character names with their ASCII eqivalent expressed in octal.
name | value | alternate name | name | value | alternate name
| |
nul | 000 | null | soh | 001 |
| |
stx | 002 | etx | 003 |
| ||
eot | 004 | enq | 005 |
| ||
ack | 006 | bel | 007 | bell
| ||
bs | 010 | backspace | ht | 011 | tab
| |
nl | 012 | newline | vt | 013 |
| |
np | 014 | page | cr | 015 | return
| |
so | 016 | si | 017 |
| ||
dle | 020 | dc1 | 021 |
| ||
dc2 | 022 | dc3 | 023 |
| ||
dc4 | 024 | nak | 025 |
| ||
syn | 026 | etb | 027 |
| ||
can | 030 | em | 031 |
| ||
sub | 032 | esc | 033 | escape
| ||
fs | 034 | gs | 035 |
| ||
rs | 036 | us | 037 |
|
char? obj | R5RS |
Returns #t if obj is a character, otherwise returns #f .
|
char=? char1 char2 | R5RS |
char<? char1 char2 | R5RS |
char>? char1 char2 | R5RS |
char<=? char1 char2 | R5RS |
char>=? char1 char2 | R5RS |
These procedures impose a total ordering on the set of characters.
It is guaranteed that under this ordering:
|
char-ci=? char1 char2 | R5RS |
char-ci<? char1 char2 | R5RS |
char-ci>? char1 char2 | R5RS |
char-ci<=? char1 char2 | R5RS |
char-ci>=? char1 char2 | R5RS |
These procedures are similar to char=? et cetera, but they treat
upper case and lower case letters as the same. For example,
(char-ci=? #\A #\a) returns #t .
|
char-alphabetic? char | R5RS |
char-numeric? char | R5RS |
char-whitespace? char | R5RS |
char-upper-case? letter | R5RS |
char-lower-case? letter | R5RS |
These procedures return #t if their arguments are alphabetic, numeric,
whitespace, upper case, or lower case characters, respectively, otherwise they
return #f . The following remarks, which are specific to the ASCII character
set, are intended only as a guide: The alphabetic characters are the 52
upper and lower case letters. The numeric characters are the ten decimal
digits. The whitespace characters are space, tab, line feed, form feed,
and carriage return.
|
char->integer char | R5RS |
integer->char n | R5RS |
Given a character, char->integer returns an exact integer
representation of the character. Given an exact integer that is the
image of a character under char->integer , integer->char returns
that character. These procedures implement order-preserving
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) => #tand x and y are in the domain of integer->char , then
(<= (char->integer a) (char->integer b)) => #t (char<=? (integer->char x) (integer->char y)) => #t |
char-upcase char | R5RS |
char-downcase char | R5RS |
These procedures return a character char2 such that
(char-ci=? char char2) . In addition, if char is alphabetic, then the
result of char-upcase is upper case and the result of char-downcase is
lower case.
|