The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group


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);






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>.

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Copyright © 1997 The Open Group
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