фыафыай

#include <iostream>
using namespace std;

class vec {
        friend class arr_vec;
        private: double x, y, z;
        public: friend vec operator+ (vec, vec);
                        friend vec operator* (vec, double);
                        friend vec operator* (double, vec);
                        friend vec toVec(double x, double y, double z);
                        void show() {
                                cout<<endl<<"X: "; cout<<x;
                                cout<<endl<<"Y: "; cout<<y;
                                cout<<endl<<"Z: "; cout<<z;
                                cout<<endl;
                                }
};

vec toVec(double x, double y, double z) {
        vec v;
        v.x=x;
        v.y=y;
        v.z=z;
        return v;
}
vec operator+ (vec c, vec d) {
        return toVec(c.x+d.x, c.y+d.y, c.z+d.z);}

vec operator* (vec c, double d) {
        return toVec(c.x*d, c.y*d, c.z*d);}

vec operator* (double c, vec d) {
        return toVec(c*d.x, c*d.y, c*d.z);}

class arr_vec {
        private: double *x, *y, *z;
                                int n;
        public: arr_vec(int);
                        ~arr_vec();
                        void put(int, vec);
                        vec operator[] (int) const;
                        void operator=(const arr_vec&);
                        friend arr_vec operator+ (const arr_vec&, const arr_vec&);
                        friend arr_vec operator* (double, const arr_vec&);
                        friend arr_vec operator* (const arr_vec&, double);
                        void show();
                        void add(const vec&);
};

void arr_vec::add(const vec &A) {
    double *tmpx, *tmpy, *tmpz;
    tmpx = new double [n+1];
    tmpy = new double [n+1];
    tmpz = new double [n+1];
    for(int i=0; i<n; i++) {
        tmpx[i]=x[i];
        tmpy[i]=y[i];
        tmpz[i]=z[i];
    }
    tmpx[n]=A.x;
    tmpy[n]=A.y;
    tmpz[n]=A.z;
    delete[]x; delete[]y; delete[]z;
    x=tmpx;
    y=tmpy;
    z=tmpz;
    n++;
}

arr_vec::arr_vec(int N) {
        n=N;
        x=new double[n];
        y=new double[n];
        z=new double[n];
        for(int i=0; i<n; i++) {x[i]=y[i]=z[i]=0;}
}
arr_vec::~arr_vec() {
        delete[]x;
        delete[]y;
        delete[]z;
}
void arr_vec::put(int N, vec v) {
        if (n<N) return;
        x[N]=v.x;
        y[N]=v.y;
        z[N]=v.z;
        //v.x=x[N+1];
        //v.y=y[N+1];
        //v.z=z[N+1];
}
vec arr_vec::operator [](int N) const {
        return toVec(x[N], y[N], z[N]);
}
arr_vec operator+ (const arr_vec& c, const arr_vec& d) {
        arr_vec *e;
        e=new arr_vec(c.n);
        for(int i=0; i<e->n; i++) e->put(i, c[i]+d[i]);
        return *e;
}
arr_vec operator* (double c, const arr_vec& d) {
        arr_vec *e;
        e=new arr_vec(d.n);
        for (int i=0; i<e->n; i++) e->put(i, c*d[i]);
        return *e;
}
arr_vec operator* (const arr_vec& c, double d) {
        arr_vec *e;
        e=new arr_vec(c.n);
        for (int i=0; i<e->n; i++) e->put(i, c[i]*d);
        return *e;
}
void arr_vec::show() {
        cout<<endl<<"X: ";
                for(int i=0; i<n; i++) cout<<x[i]<<"\t";
        cout<<endl<<"Y: ";
                for(int i=0; i<n; i++) cout<<y[i]<<"\t";
        cout<<endl<<"Z: ";
                for(int i=0; i<n; i++) cout<<z[i]<<"\t";
        cout<<endl;
}
void arr_vec::operator =(const arr_vec& A) {
        n=A.n;
        x=new double[n];
        y=new double[n];
        x=new double[n];
        for(int i=0; i<n; i++) {x[i]=A.x[i]; y[i]=A.y[i]; z[i]=A.z[i];}
}

int main() {
        double g=3.;
        arr_vec c(2), d(2);
        vec e, f;
        e=toVec(1,2,3);
        f=toVec(4,5,6);
        c.put(0, e);
        c.show();
        d.put(1,f);
        d.show();
        (c+d).show();
        (g*c).show();
        c=c+d; c.show();
        c.put(0,toVec(0,0,0)); c.show();
        (d[1]).show();
        c.add(toVec(666,666,666));
        c.show();

}