NAME
isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii - character classification
SYNOPSIS
#include <ctype.h>
isalpha(c)
. . .
DESCRIPTION
These macros classify ASCII-coded integer values by table lookup. Each is a predicate returning nonzero for true, zero for false. Isascii is defined on all integer values; the rest are defined only where isascii is true and on the single non-ASCII 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
- isalnum
- c is an alphanumeric character
- isspace
- c is a space, tab, carriage return, newline, 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)
- iscntrl
- c is a delete character (0177) or ordinary control character (less than 040).
- isascii
- c is an ASCII character, code less than 0200
SEE ALSO
ascii(7)