prog2.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 33 行

#include <iostream.h>
class Sample
{
protected:
	int x;
public:
	Sample() { x=0; }
	Sample(int val) { x=val; }
	void operator++() { x++; }
};
class Derived:public Sample
{
	int y;
public:
	Derived():Sample() { y=0; }
	Derived(int val1,int val2):Sample(val1) { y=val2; }
	void operator--() { x--;y--; }
	void disp()
	{
		cout << "x=" << x << ",y=" << y << endl;
	}
};
void main()
{
	Derived d(3,5);
	d.disp();
	d++;
	d.disp();
	d--;
	d--;
	d.disp();
}