<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`² `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. Note: ² This function is applicable to C++ only.

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