<ctype.h>

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


`isascii`¹ `isalnum` `isalpha` `isblank`	`iscntrl` `isdigit` `isgraph` `islower`	`isprint` `ispunct` `isspace` `isupper`	`isxdigit` `toascii`¹ `tolower` `toupper`
Note: ¹ These functions are not available when LOCALETYPE(*CLD) is specified on the compilation command.