Ascertains whether a given character is a hexadecimal digit

#include <ctype.h>
int isxdigit ( int c  );

The function isxdigit( ) tests whether its character argument is a hexadecimal digit. The results depend on the current locale setting for the localization category LC_CTYPE, which you can query or change using the setlocale( ) function. In the C locale, isxdigit( ) returns a nonzero value (that is, TRue) if the character is between '0' and '9' inclusive, or between 'A' and 'F' inclusive, or between 'a' and 'f' inclusive. If not, the function returns 0 (false).

Example

See the example for isprint( ) in this chapter.

See Also

The corresponding C99 function for wide characters, iswxdigit( ); isalnum( ), isalpha( ), isblank( ), iscntrl( ), isdigit( ), isgraph( ), islower( ), isprint( ), ispunct( ), isspace( ), isupper( ), isxdigit( ); the extensible wide-character classification function, iswctype( )