T12 - zad.1.

#include <iostream>
#include <cmath>
class Vektor3d{
    double x,y,z;
public:
    Vektor3d(){x=0; y=0; z=0;}
    Vektor3d(double a, double b, double c){x=a; y=b; z=c;}
    void PostaviX (double x){Vektor3d::x=x;}
    void PostaviY(double y){Vektor3d::y=y;}
    void PostaviZ(double z){Vektor3d::z=z;}
    void Ocitaj(double &x, double &y, double &z)
    {x=Vektor3d::x; y=Vektor3d::y; z=Vektor3d::z;}
    friend std::ostream& operator<<(std::ostream &tok, const Vektor3d &v)
      { return tok<<"("<<v.x<<","<<v.y<<","<<v.z<<")"; }
    double DajX() const{return x;}
    double DajY() const{return y;}
    double DajZ() const{return z;}
    friend Vektor3d operator+(const Vektor3d &a, const Vektor3d &b)
    {return {a.x+b.x, a.y+b.y, a.z+b.z};}
    Vektor3d &operator+=(const Vektor3d &v)
    {this->x+=v.x; this->y+=v.y; this->z+=v.z; return *this;}
    Vektor3d &operator*=(const Vektor3d &v)
    {this->x*=v.x; this->y*=v.y; this->z*=v.z; return *this;}

};
int main(){
    Vektor3d a(1,2,3),b(10,10,10),c;
    c=a+b; std::cout<<c;
    Vektor3d v(a);
    v*=a; std::cout<<v;

return 0;
}