Zilog ZUSBOPTS - Manual (Page 448)

Standard Functions UM017105-0511
420
Zilog Developer Studio II – ZNEO™
User Manual
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.
Synopsis
#include <ctype.h>

int isdigit(int c);
Example
int r;

char c='4';

r=isdigit(c);