Name

isxdigit, ishexnumber - hexadecimal-digit character test

Library

Standard C Library (libc, -lc)

Synopsis

#include <ctype.h>

int
isxdigit(int c);

int
ishexnumber(int c);

Description

The isxdigit() function tests for any hexadecimal-digit character. For any locale, this includes the following characters only:

``0''

``1'' ``2'' ``3'' ``4''

``5''

``6'' ``7'' ``8'' ``9''

``A''

``B'' ``C'' ``D'' ``E'' ``F'' ``a'' ``b'' ``c'' ``d''

``e''

``f''

For single C chars locales (see multibyte(3) ) the value of the argument is representable as an unsigned char or the value of EOF.

Return Values

The isxdigit() function returns zero if the character tests false and returns non-zero if the character tests true.

Compatibility

Although isxdigit() and ishexnumber() accept arguments outside of the range of the unsigned char type in locales with large character sets, this is a 4.4BSD extension and the isxwdigit() and iswhexnumber() functions should be used instead for maximum portability.

See Also

ctype(3) , iswxdigit(3) , multibyte(3) , ascii(7)

Standards

The isxdigit() function conforms to ISO/IEC 9899:1990 (``ISO C89'').

Table of Contents

• Name
• Library
• Synopsis
• Description
• Return Values
• Compatibility
• See Also
• Standards