#ifndef STACK_DOUBLEH
#define STACK_DOUBLEH
#include <cstddef>   //for size_t

class stack_double {
public:
	typedef double value_type;
private:
	static const size_t max_size = 100;
	value_type a[max_size];
	size_t n;   //stack pointer: subscript of next free element
public:
	stack_double(): n(0) {}
	~stack_double();

	void push(value_type d);
	value_type pop();

	friend bool operator==(const stack_double& s1, const stack_double& s2);
};

inline bool operator!=(const stack_double& s1, const stack_double& s2) {
	return !(s1 == s2);
}
#endif