prog5.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 38 行

#include <iostream.h>
class Vector
{
	int x,y;
public:
	Vector() {}
	Vector(int i,int j) { x=i;y=j; }
	void disp()
	{
		cout << "(" << x << "," << y << ")";
	}
	friend Vector add(Vector &v1,Vector &v2)
	{
		Vector v;
		v.x=v1.x+v2.x;
		v.y=v1.y+v2.y;
	    return v;
	}
	friend Vector sub(Vector &v1,Vector &v2)
	{
		Vector v;
		v.x=v1.x-v2.x;
		v.y=v1.y-v2.y;
	    return v;
	}
};
void main()
{
	Vector v1(10,20),v2(4,5),v3;
	v3=add(v1,v2);
	cout << "输出结果:" << endl;
	cout << "  ";v1.disp();cout << "+";v2.disp();
	cout << "=";v3.disp();cout << endl;
	v3=sub(v1,v2);
	cout << "  ";v1.disp();cout << "-";v2.disp();
	cout << "=";v3.disp();cout << endl;
}