template<class TYPE>
TYPE round(TYPE t,int prec)
{
    for(int i=0;i<prec;i++)
        t*=10;
    int n=(int)t;
    if(t-n>=0.5)
       n++;
    t=n;
    for(int i=0;i<prec;i++)
        t/=10;
    return t;
}


struct Point{
    int x, y;
};

class Circle{

    Point centre;
    double radius;
public:
    Circle(int x, int y, double rad){
        centre.x = x;
        centre.y = y;
        radius = rad;
    }

    Circle(){
        centre.x = 0;
        centre.y = 0;
        radius = 10;
    }

    double calcDistance(Circle& cir){
        int dx = abs(centre.x - cir.centre.x);
        int dy = abs(centre.y - cir.centre.y);
        double dist = std::sqrt(dx * dx + dy * dy);
        return round(dist, 1);
    }
};

class Sector : public Circle
{
    int angle;

public:
    Sector() : Circle(){
        angle = 0;
    }

    Sector(int x, int y, double rad, int an) : Circle(x, y, rad){
        angle = an;
    }
};



int main(){

    Circle x(10, 10, 20), xx(20, 20, 20);

    cout << x.calcDistance(xx) << endl;

    Sector z(10, 10, 20, 30), zz(20, 20, 20, 30);

    cout << z.calcDistance(zz) << endl;