Zilog Z8F0130 - Manual (Page 466)

Appendix B. C Standard Library UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
isalnum
Tests for any character for which isalpha or isdigit is true.
Synopsis
include <ctype.h>

int isalnum(int c);
Example
int r;

char c='a';

r=isalnum(c)
isalpha
Tests for any character for which isupper or islower is true.
Synopsis
#include <ctype.h>

int isalpha(int c);
Example
int r;

char c='a';

r=isalpha(c)
iscntrl
Tests for any control character.
Synopsis
#include <ctype.h>

int iscntrl(int c);
Example
int r;

char c=NULL;

r=iscntrl(c);
isdigit
Tests for any decimal digit.