#include <cstdlib>
#include <iostream>
#include <cmath>
#include <memory.h>
using namespace std;
 
struct vect
{
  double x,y;
 
};
 
void print(vect* c)
{
  cout<<"c("<<c->x<<","<<c->y<<")"<<endl;
}
 
int main()
{
  vect a,b,c;//объявим переменные типа Vect
  memset(&a,0,sizeof(a));
  memset(&b,0,sizeof(b));
  memset(&c,0,sizeof(c));
  print (&c);
  cout<<"vector 1"<<endl;
  cin>>a.x;
  cin>>a.y;
  cout<<" a= " << sqrt(a.x*a.x+a.y*a.y)<<endl;
  cout<<"vector 2"<<endl;
  cin>>b.x;
  cin>>b.y;
  cout<<"|b|= "<< sqrt(b.x*b.x+b.y*b.y)<<endl;
  cout<<"|a+b|= "<<sqrt((a.x+b.x)*(a.x+b.x)+(a.y+b.y)*(a.y+b.y))<<endl;
  cout<<"|a-b|= "<<sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y))<<endl;
  cout<<"|a*3| "<< sqrt((a.x*3)*(a.x*3)+(a.y*3)*(a.y*3))<<endl;
 
return 0;
}

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