/**
   A queen in the eight queens problem.
*/
public class Queen
{
   private int row;
   private int column;

   /**
      Constructs a queen at a given position.
      @param r the row 
      @param c the column
   */
   public Queen(int r, int c)
   {
      row = r;
      column = c;
   }

   /**
      Checks whether this queen attacks another.
      @param other the other queen
      @return true if this and the other queen are in the same
      row, column, or diagonal.
   */
   public boolean attacks(Queen other)
   {
      return row == other.row
         || column == other.column
         || Math.abs(row - other.row) == Math.abs(column - other.column);
   }

   public String toString() 
   { 
      return "" + "abcdefgh".charAt(column) + (row + 1) ; 
   }
}

