Program of file data:

FileData::FileData( ffblk& blk ) :

    fileName( blk.ff_name ),

    fileDate( (blk.ff_fdate >> 5) & 0x000F,

              blk.ff_fdate & 0x0001F,

              (blk.ff_fdate >> 9) + 1980 ),

    fileSize( blk.ff_fsize ),

    fileTime( blk.ff_ftime >> 11,

              (blk.ff_ftime >> 5) & 0x3F,

              blk.ff_ftime & 0x1F )

{

}

void FileData::printOn( ostream& outputStream ) const

{

    outputStream << setw( 14 ) << setiosflags( ios::left )   << fileName

                 << setw( 18 ) << fileDate

                 << setw( 17 ) << resetiosflags( ios::left ) << fileTime

                 << setw( 10 ) << fileSize << " bytes";

}

int FilesByName::isEqual( const Object& testFile ) const

{

    return fileName == ( (FilesByName&)testFile ).fileName;

}

int FilesByName::isLessThan( const Object& testFile ) const

{

    return fileName < ( (FilesByName&)testFile ).fileName;

}

int FilesByDate::isEqual( const Object& testFile ) const

{

    return fileDate == ( (FilesByDate&)testFile ).fileDate &&

           fileTime == ( (FilesByDate&)testFile ).fileTime;

}

int FilesByDate::isLessThan( const Object& testFile ) const

{

    if( fileDate == ( (FilesByDate&)testFile ).fileDate )

        return fileTime < ( (FilesByDate&)testFile ).fileTime;

    else

        return fileDate < ( (FilesByDate&)testFile ).fileDate;

}

int FilesBySize::isEqual( const Object& testFile ) const

{

    return fileSize == ( (FilesBySize&)testFile ).fileSize;

}

int FilesBySize::isLessThan( const Object& testFile ) const

{

    return fileSize < ( (FilesBySize&)testFile ).fileSize;

}