#include <stdlib.h>

class charstack
{


public:
	charstack();
	virtual ~charstack();	

	
	void push(char p,char a);
	void pop(char &q, char &a);
	bool empty();
	void clear();

	void push(char p);
	void pop(char &q);

private:
	int bottom;
	int top;
	char stack[100];
};