cctype.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: <cctype>	<cctype>	11/04/2016	<cctype>	cctype header	3fd18bfd-c414-4def-bac1-c362e1fe8b71

<cctype>

Includes the Standard C library header <ctype.h> and adds the associated names to the std namespace.

Requirements

Header: <cctype>

Namespace: std

Remarks

Including this header ensures that the names declared using external linkage in the Standard C library header are declared in the std namespace.

Functions

int isalnum(int c);
int isalpha(int c);
int isblank(int c);
int iscntrl(int c);
int isdigit(int c);
int isgraph(int c);
int islower(int c);
int isprint(int c);
int ispunct(int c);
int isspace(int c);
int isupper(int c);
int isxdigit(int c);
int tolower(int c);
int toupper(int c);

See also

Header Files Reference
C++ Standard Library Overview
Thread Safety in the C++ Standard Library