8.4

#include<iostream>
#include<cmath>
#include<ctime>
#include<iomanip>
using namespace std;
const int n = 100;
class vector {
public:
    int l;
    int* arr;
    vector() {
        arr = new int[n];
        l = n;
    }
    vector(int p) {
        arr = new int[p];
        l = p;
    }
                                                                                                                                                                                                                                                     vector(vector& a) {    this->l = a.l;  this->arr = a.arr;}
                                                                                                                                                                                                                                                         void r(int o) {    int* arr1 = new int[o];for (int i = 0; i < l; i++) {    arr[i] = arr1[i];}delete[] arr;arr = arr1;delete[] arr1;arr1 = NULL;}
    void raz(int l) {
        this->l = l;
    }
    int kol() {
        return l;
    }
    vector copys(vector& a) // копирование
    {
        int p = a.l;
        arr = new int[p];
        for (int i = 0; i < p; i++)
        {
            arr[i] = a.arr[i];
        }
        return *arr;
    }
    int at(int o) {
        if (o<0 || o>l) {
            cout << "Vyxod za predela vectora" << endl;
            return 0;
        }
        else {
            return arr[o];
        }
    }
    void zanes(int f, int k) {
        if (k<0 || k>l) {
            cout << "Vyxod za predela vectora" << endl;
        }
        else {
            arr[k] = f;
        }
    }
    int umn(vector& a) {
        int sum = 0, vr = 0;
        if (a.l != this->l) return 0;
        for (int i = 0; i < l; i++) {
            vr = a.arr[i] * arr[i];
            sum += vr;
        }
        return sum;
    }
    int dlina() {
        int sum = 0;;
        for (int i = 0; i < l; i++) {
            sum += pow(arr[i], 2);
        }
        sum = pow(sum, 0.5);
        return sum;
    }
    void random() {
        srand(time(0));
        for (int i = 0; i < l; i++) {
            arr[i] = rand() % 101 - 50;
            cout << setw(4) << arr[i];
        }
    }
    void vvod() {
        for (int i = 0; i < l; i++) {
            cin >> arr[i];
        }
    }
    void vyvod() {
        for (int i = 0; i < l; i++) {
            cout << setw(3) << arr[i];
        }
    }
    ~vector() {
        cout << "destruct" << endl;
    }
};
void ort(vector a, vector b, vector c) {
    int l;
    l = a.umn(b);
    if (l == 0) cout << "Vector 1 and vector 2 ortogonalny" << endl;
    l = a.umn(c);
    if (l == 0) cout << "Vector 1 and vector 3 ortogonalny" << endl;
    l = b.umn(c);
    if (l == 0) cout << "Vector 2 and vector 3 ortogonalny" << endl;
}
void main() {
    setlocale(LC_ALL, "rus");
    int k, l, x;
    vector a;
    vector b;
    vector c;
    cout << "Введите размер вектора" << endl;
    cin >> k;
    a.raz(k);
    b.raz(k);
    c.raz(k);
    cout << "1 - ввод с клавиатуры" << endl << "2 - ввод рандомных значений" << endl;
    cin >> x;
    if (x == 1) {
        cout << "Vector 1:" << endl;
        a.vvod();
        cout << endl << "Длина вектора 1 = " << a.dlina() << endl;
        cout << "Vector 2:" << endl;
        b.vvod();
        cout << endl << "Длина вектора 2 = " << b.dlina() << endl;
        cout << "Vector 3:" << endl;
        c.vvod();
        cout << endl << "Длина вектора 3 = " << c.dlina() << endl;
    }
    else {
        a.random();
        cout << endl << "Длина вектора 1 = " << a.dlina() << endl;
        b.random();
        cout << endl << "Длина вектора 2 = " << b.dlina() << endl;
        c.random();
        cout << endl << "Длина вектора 3 = " << c.dlina() << endl;
    }
    ort(a, b, c);
    system("pause");
}