10-5.cpp

来自「为初学者提供的最佳的C++程序设计源程序库」· C++ 代码 · 共 39 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;
}