/**
 *This interface defines a method that obtains a string
 *representation of the specified sales.
 *
 *@author 張維
 *@version  1.0.0
 *@see Sales
 */
public interface SalesFormatter {
	
	/**
	 * Produces a string representation of the sales information.
	 *
	 * @param sales  the <code>Sales</code> object.
	 * @return  the string representation of the specified <code>Sales</code> object.
   */
   public abstract String formatSales(Sales sales);
}