<ctype.h>

The <ctype.h> include file defines functions used in character classification. The functions defined in <ctype.h> are:

isalnum iscntrl isprint islower tolower
isalpha isdigit ispunct isupper toupper
isblank isgraph isspace isxdigit  

In extended mode, <ctype.h> also includes definitions for the following IBM C and C++ Compilers extensions:

isascii _iscsymf _toascii _tolower _toupper
_iscsym        

For both OS/2 and Windows, in IBM C and C++ Compilers, the <ctype.h> functions are all implemented as macros.



#include