CTYPE

Section: C Library Functions (3)
Index Return to Main Contents
 

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO

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Time: 10:17:15 GMT, December 28, 2024