task3

#include <iostream>

using namespace std;

class Vector {
    public:
        double x;
        double y;
        double z;
        void input() {
            double a, b, c;
            cin >> a >> b >> c;
            this->x = a;
            this->y = b;
            this->z = c;
        }
        Vector operator+(Vector tmp) {
            Vector a;
            a.x = this->x + tmp.x;
            a.y = this->y + tmp.y;
            a.z = this->z + tmp.z;
            return a;
        }
        Vector operator-(Vector tmp) {
            Vector a;
            a.x = this->x - tmp.x;
            a.y = this->y - tmp.y;
            a.z = this->z - tmp.z;
            return a;
        }
        double operator*(Vector tmp) {
            return this->x*tmp.x + this->y*tmp.y + this->z*tmp.z;
        }
        void output() {
            cout << "(" << x << ", " << y << ", " << z << ")" << endl;
        }
};

int main()
{
    int n = 3;
    Vector mass1[n];
    Vector mass2[n];
    for (int i = 0; i<n; i++)
    {
        cout << "Please, enter 3 coords from " << i << " element from 1 mass: ";
        mass1[i].input();
    }
    for (int i = 0; i<n; i++)
    {
        cout << "Please, enter 3 coords from " << i << " element from 2 mass: ";
        mass2[i].input();
    }
    Vector tmp;
    for (int i = 0; i<n; i++)
    {
        cout << "mass1["<<i<<"] + mass2[" << i << "] = ";
        tmp = mass1[i]+mass2[i];
        tmp.output();
    }
    for (int i = 0; i<n; i++)
    {
        cout << "mass1["<<i<<"] - mass2[" << i << "] = ";
        tmp = mass1[i]-mass2[i];
        tmp.output();
    }
    double tmp2;
    for (int i = 0; i<n; i++)
        cout << "mass1["<<i<<"] * mass2[" << i << "] = " << mass1[i]*mass2[i] << endl;
    return 0;
}