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isxdigit - test for hexadecimal digit

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Syntax

#include <ctype.h>

int isxdigit(int c);

Description isxdigit tests whether the character c is a hexadecimal digit character (0-9, A-F or a-f).

In all cases, the argument c is an int, the value of which must be representable as an
unsigned char or must equal the value of the macro EOF. If the argument c has any other
value, the behavior is undefined.

Return val.

!= 0

0

Hexadecimal digit

Not a hexadecimal digit

Notes

isxdigit() is implemented both as a function and as a macro. To generate a function call,
the definition of the macro name must be first undefined (#undef isxdigit).

The behavior of isxdigit() is determined by the class xdigit of the current locale. The
current locale is the C locale, unless it was explicitly changed using setlocale().

See also

isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(),
ispunct(), isspace(), isupper(), ctype.h.