shiti4_4_3.cpp

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#include<iostream.h>
class Vector
{
public:
	Vector(){}
	Vector(int i,int j){x=i;y=j;}
	friend Vector operator+=(Vector v1,Vector v2)
	{
		v1.x+=v2.x;
		v1.y+=v2.y;
		return v1;
	}
	Vector operator-=(Vector v)
	{
		Vector temp;
		temp.x=x-v.x;
		temp.y=y-v.y;
		return temp;
	}
	void display(){cout<<"("<<x<<","<<y<<")"<<endl;}
private:
	int x,y;
};
void main()
{
	Vector v1(1,2),v2(3,4),v3,v4;
	v3=v1+=v2;
	v4=v1-=v2;
	cout<<"v1=";
	v1.display();
	cout<<"v2=";
	v2.display();
	cout<<"v3=";
	v3.display();
	cout<<"v4=";
	v4.display();
}