seqstack.h

数据结构中有关栈的知识

#include <iostream>
#include "stack.h"
using namespace std;
class seqstack:public stack
{
public:
	stack *top;
	//stack *bottom;

    seqstack();
	~seqstack();
	void push(char&);
	void pop(char&);
	bool isempty() {return (top->link==NULL)?1:0;}
	//void sort();
	stack *gethead() {return top;}
	friend ostream& operator <<(ostream& out,seqstack& l);
	friend istream& operator >>(istream& in,seqstack& l);
	void gettop(char &ch)   {ch=top->data;}
};