#include <iostream>

using namespace std;
int main()
{
  int sumAB = 0, sumBC = 0, sumCA = 0;
  int a[3],
    b[3],
    c[3];
    cout << "Massiv one: ";
    for(int i = 0; i <= 2; i++)
    {
        a[i] = rand() % 20;
        cout << a[i] << " ";
     }
    cout << endl;

    cout << "Massiv two: ";
    for(int i = 0; i <= 2; i++)
    {
        b[i] = rand() % 20;
        cout << b[i] << " ";
    }
    cout << endl;

    cout << "Massiv three: ";
    for(int i = 0; i <= 2; i++)
    {
        c[i] = rand() % 20;
        cout << c[i] << " ";
    }
    cout << endl;

    for(int A = 0; A <= 2; A++)
    {
        sumAB += a[A] * b[A];
        sumBC += b[A] * c[A];
        sumCA += c[A] * a[A];
    }

    cout << "Скалярное произведение AB: " << sumAB << endl;
    cout << "Скалярное произведение BC: " << sumBC << endl;
    cout << "Скалярное произведение CA: " << sumCA << endl;

}