#include
#include
using namespace std;
class vector_2{
protected:
double x,y;
public:
vector_2(){}
vector_2(double xx,double yy){
x=xx;
y=yy;
}
vector_2 operator+(vector_2 &v){
return vector_2(x+v.x,y+v.y);
}
vector_2 operator-(vector_2 &v){
return vector_2(x-v.x,y-v.y);
}
virtual double norm(){
return sqrt(x*x+y*y);
}
virtual void display(){
cout<<'('< }
};
class vector_3:public vector_2{
protected:
double z;
public:
vector_3(){}
vector_3(double xx,double yy,double zz):vector_2(xx,yy){
z=zz;
}
vector_3 operator+(vector_3 &v){
return vector_3(x+v.x,y+v.y,z+v.z);
}
vector_3 operator-(vector_3 &v){
return vector_3(x-v.x,y-v.y,z-v.z);
}
double norm(){
return sqrt(x*x+y*y+z*z);
}
void display(){
cout<<'('< }
};
int main(){
vector_2 *t;
vector_2 p1,p2,p3;
double a,b,c;
double x,y,z;
cin>>a>>b>>c;
cin>>x>>y>>z;
t=&p3;
p1=vector_2(a,b);
p2=vector_2(x,y);
cout<<"v1=";p1.display();cout< cout<<"v2=";p2.display();cout< p3=p1+p2;
cout<<"v1+v2=";t->display();cout< cout<<"the norm of the vector is "<norm()< p3=p1-p2;
cout<<"v1-v2=";t->display();cout< cout<<"the norm of the vector is "<norm()<
vector_3 q1,q2,q3;
t=&q3;
q1=vector_3(a,b,c);
q2=vector_3(x,y,z);
cout<<"v1=";q1.display();cout< cout<<"v2=";q2.display();cout< q3=q1+q2;
cout<<"v1+v2=";t->display();cout< cout<<"the norm of the vector is "<norm()< q3=q1-q2;
cout<<"v1-v2=";t->display();cout< cout<<"the norm of the vector is "<norm()<
return 0;
}
