ctype.h - character types
#include <ctype.h>
The <ctype.h> header declares the following as functions and may also define them as macros. Function prototypes must be provided for use with an ISO C compiler.int isalnum(int); int isalpha(int); int isascii(int); int iscntrl(int); int isdigit(int); int isgraph(int); int islower(int); int isprint(int); int ispunct(int); int isspace(int); int isupper(int); int isxdigit(int); int toascii(int); int tolower(int); int toupper(int);
The following are defined as macros:
int _toupper(int); int _tolower(int);
None.
None.
isalnum(), isalpha(), isascii(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), mblen(), mbstowcs(), mbtowc(), setlocale(), toascii(), tolower(), _tolower(), toupper(), _toupper(), wcstombs(), wctomb(), <locale.h>.