/**
 * Base interface for stack implementations
 * CSE326b project 2.
 * @version Wi08
 */
public interface Stack<E> {
 /**
  * Report whether the stack is empty
  * @return  true if the stack has no elements
  */
 public boolean isEmpty();


 /**
  * Get the most recently inserted item in the stack.
  * Does not alter the stack.
  *
  * @return the most recently pushed item on the stack.
  * @exception EmptyStackException thrown if stack is empty.
  */
 public E top();


 /**
  * Remove the most recently inserted item from the stack.
  * @exception EmptyStackException thrown if stack is empty.
  */
 public void pop();



 /**
  * Push a new item onto the stack
  * @param x the item to insert.
  */
 public void push( E x );


 /**
  * Remove all elements from the stack.
  */
 public void makeEmpty();

}