.\" @(#)ctype.3 6.3 (Berkeley) %G%
isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii \- character classification macros
These macros classify ASCII-coded integer values
Each is a predicate returning nonzero for true,
are defined on all integer values; the rest
is true and on the single non-ASCII value
is an alphanumeric character
is a space, tab, carriage return, newline, vertical tab, or formfeed
is a punctuation character (neither control nor alphanumeric)
is a printing character, code 040(8) (space) through 0176 (tilde)
is a printing character, like
is a delete character (0177) or ordinary control character
is an ASCII character, code less than 0200
is converted to lower case. Return value is undefined if not
is converted to upper case. Return value is undefined if not
is converted to be a valid ascii character.