Share via


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


Header: <cctype>

Namespace: std


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


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