Functions HI-TECH C ISALNUM

ISALNUM, ISALPHA, ISDIGIT, ISLOWER et. al.

SYNOPSIS

#include <ctype.h>

isalnum(char c)
isalpha(char c)
isascii(char c)
iscntrl(char c)
isdigit(char c)
islower(char c)
isprint(char c)
isgraph(char c)
ispunct(char c)
isspace(char c)
isupper(char c)
char c;

DESCRIPTION

These macros, defined in ctype.h, test the supplied character for membership in one of several overlapping groups of characters. Note that all except isascii are defined for c if isascii(c) is true.

isalnum(c)

c is alphanumeric

isalpha(c)

c is in A-Z or a-z

isascii(c)

c is a 7 bit ascii character

iscntrl(c)

c is a control character

isdigit(c)

c is a decimal digit

islower(c)

c is in a-z

isprint(c)

c is a printing char

isgraph(c)

c is a non-space printable character

ispunct(c)

c is not alphanumeric

isspace(c)

c is a space, tab or newline

isupper(c)

c is in A-Z

isxdigit(c)

c is in 0-9 or a-f or A-F

SEE ALSO

toupper, tolower, toascii