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

Description:
    The isxdigit function tests for any hexadecimal-digit character.  These
    characters are the digits ('0' through '9') and the letters ('a' through
    'f') and ('A' through 'F').

Returns:
    The isxdigit function returns a non-zero value when the argument is a
    hexadecimal digit; otherwise, zero is returned.

See Also:
    isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct,
    isspace, isupper, tolower, toupper

Example:
    #include <stdio.h>
    #include <ctype.h>

    char chars[] = {
        'A',
        '5',
        '$'
    };

    #define SIZE sizeof( chars ) / sizeof( char )

    void main()
      {
        int   i;

        for( i = 0; i < SIZE; i++ ) {
          printf( "Char %c is %sa hexadecimal digit"
                " character\n", chars[i],
                ( isxdigit( chars[i] ) ) ? "" : "not " );
        }
      }

    produces the following:

    Char A is a hexadecimal digit character
    Char 5 is a hexadecimal digit character
    Char $ is not a hexadecimal digit character

Classification:
    ANSI

Systems:
    All