is ...

Test integers representing ASCII characters for specified conditions. These functions are implemented as functions and macros. The test conditions include:

Function	Test conditions
isalnum	Alphanumeric (A-Z, a-z, or 0-9)
isalpha	Letter (A-Z or a-z)
isascii	ASCII character (0x00-0x7F)
iscntrl	Control character (0x00-0x1F or 0x7F)
isdigit	Digit (0-9)
isgraph	Printable character except space
islower	Lowercase letter (a-z)
isodigit	Octal digit (0-7)
isprint	Printable character (0x20-0x7E)
ispunct	Punctuation character
isspace	White-space character (0x09-0x0D or 0x20)
isupper	Uppercase letter (A-Z)
isxdigit	Hexadecimal digit (A-F, a-f, or 0-9)

All these functions except isascii produce a defined result only for integer values corresponding to the ASCII character set, or for the nonASCII value EOF.

#include <ctype.h>

int isalnum (int c);

int isalpha (int c);

int isascii (int c);

int iscntrl (int c);

int isdigit (int c);

int isgraph (int c);

int islower (int c);

int isodigit (int c);

int isprint (int c);

int ispunct (int c);

int isspace (int c);

int isupper (int c);
int isxdigit (int c);

Parameters

c: Integer to test.

Return Values

Not 0: The integer satisfies the test condition.
0: The integer does not satisfy the test condition.

Requirements

Versions	Defined in	Include	Link to
INtime 3.0	intime/rt/include/ctype.h	ctype.h	clib.lib

Parameters

Return Values

Requirements

See Also