prog1.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 23 行

#include <iostream.h>
class Sample
{
	int n;
public:
	Sample() {}
	Sample(int m) {	n=m; }
	friend void square(Sample &s)
	{
		s.n=s.n*s.n;
	}
	void disp()
	{
		cout << "n=" << n << endl;
	}
};
void main()
{
	Sample a(10);
	square(a);
	a.disp();
}