public BookReaderB()
{
name = new ColumnSeprator(1, 30);
isbn = new ColumnSeprator(31, 51);
author = new ColumnSeprator(52, 72);
}
public BookReaderA()
{
name = new ColumnSeprator(1, 20);
isbn = new ColumnSeprator(21, 41);
author = new ColumnSeprator(42, 62);
}
