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Synopsis:
    #include <mbstring.h>
    int _ismbcalnum( unsigned int ch );

Description:
    The _ismbcalnum function tests if the multibyte character argument ch is
    an alphanumeric character.  For example, in code page 932, 'A' through
    'Z', 'a' through 'z', or '0' through '9' and its corresponding
    double-byte versions are alphanumeric (among others).  An alphanumeric
    character is any character for which  _ismbcalpha or  _ismbcdigit is
    true.

Returns:
    The _ismbcalnum function returns zero if the argument is not an
    alphanumeric character; otherwise, a non-zero value is returned.


Example:
    #include <stdio.h>
    #include <mbctype.h>
    #include <mbstring.h>

    unsigned int chars[] = {
        '.',
        '1',
        'A',
        0x8143, /* double-byte , */
        0x8254, /* double-byte 5 */
        0x8260, /* double-byte A */
        0x8279, /* double-byte Z */
        0x8281, /* double-byte a */
        0x829A, /* double-byte z */
        0x829F, /* double-byte Hiragana */
        0x8340, /* double-byte Katakana */
        0x837F, /* illegal double-byte character */
        0x889E, /* double-byte L0 character */
        0x889F, /* double-byte L1 character */
        0x989F, /* double-byte L2 character */
        0xA6    /* single-byte Katakana */
    };

    #define SIZE sizeof( chars ) / sizeof( unsigned int )

    void main()
      {
        int   i;

        _setmbcp( 932 );
        for( i = 0; i < SIZE; i++ ) {
          printf( "%#6.4x is %sa valid "
                "multibyte alphanumeric character\n",
                chars[i],
                ( _ismbcalnum( chars[i] ) ) ? "" : "not " );
        }
      }

    produces the following:

    0x002e is not a valid multibyte alphanumeric character
    0x0031 is a valid multibyte alphanumeric character
    0x0041 is a valid multibyte alphanumeric character
    0x8143 is not a valid multibyte alphanumeric character
    0x8254 is a valid multibyte alphanumeric character
    0x8260 is a valid multibyte alphanumeric character
    0x8279 is a valid multibyte alphanumeric character
    0x8281 is a valid multibyte alphanumeric character
    0x829a is a valid multibyte alphanumeric character
    0x829f is a valid multibyte alphanumeric character
    0x8340 is a valid multibyte alphanumeric character
    0x837f is not a valid multibyte alphanumeric character
    0x889e is not a valid multibyte alphanumeric character
    0x889f is a valid multibyte alphanumeric character
    0x989f is a valid multibyte alphanumeric character
    0x00a6 is a valid multibyte alphanumeric character

Classification:
    WATCOM

Systems:
    DOS, Windows, Win386, Win32, OS/2 1.x(all), OS/2-32

See Also:
    _getmbcp, _ismbcalpha, _ismbccntrl, _ismbcdigit, _ismbcgraph,
    _ismbchira, _ismbckata, _ismbcl0, _ismbcl1, _ismbcl2, _ismbclegal,
    _ismbclower, _ismbcprint, _ismbcpunct, _ismbcspace, _ismbcsymbol,
    _ismbcupper, _ismbcxdigit, _mbbtype, _setmbcp