CTYPE.3
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- CTYPE(3) Minix Programmer's Manual CTYPE(3)
- NAME
- ctype, isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace,
- ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii -
- character classification macros
- SYNOPSIS
- #include <ctype.h>
- int isalpha(int c)
- ...
- DESCRIPTION
- These macros classify characters by table lookup. Each is a predicate
- returning nonzero for true, zero for false. Isascii and toascii are
- defined on all integer values; the rest are defined only on the range of
- unsigned char and on the special value EOF (see stdio(3)).
- isalpha c is a letter
- isupper c is an upper case letter
- islower c is a lower case letter
- isdigit c is a digit
- isxdigit c is a hex digit
- isalnum c is an alphanumeric character
- isspace c is a space, tab, carriage return, newline, vertical tab,
- or formfeed
- ispunct c is a punctuation character (neither control nor
- alphanumeric)
- isprint c is a printing character, code 040(8) (space) through
- 0176 (tilde)
- isgraph c is a printing character, similar to isprint except false
- for space.
- iscntrl c is a delete character (0177) or ordinary control
- character (less than 040).
- isascii c is an ASCII character, code less than 0200
- tolower c is converted to lower case. Return value is undefined
- if not isupper(c).
- May 12, 1986 1
-
- CTYPE(3) Minix Programmer's Manual CTYPE(3)
- toupper c is converted to upper case. Return value is undefined
- if not islower(c).
- toascii c is converted to be a valid ascii character.
- SEE ALSO
- ascii(7)
- May 12, 1986 2
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