Isgraph, Islower, Isprint – Zilog ZUSBOPTS User Manual
Page 449: Isgraph islower isprint, Synopsis, Example

UM017105-0511
Standard Functions
Zilog Developer Studio II – ZNEO™
User Manual
421
isgraph
Tests for any printing character except space (' ').
Synopsis
#include
int isgraph(int c);
Example
int r;
char c='';
r=isgraph(c);
islower
Tests for any lowercase letter 'a' to 'z'.
Synopsis
#include
int islower(int c);
Example
int r;
char c='a';
r=islower(c);
isprint
Tests for any printing character including space (' ').
Synopsis
#include
int isprint(int c);
Example
int r;
char c='1';
r=isprint(c);