экз1

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int n;
    cout << "Vvedite n: ";
    cin >> n;
    int mass[n][n];
    cout << "Vvedite elementi massiva: ";
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cout << "[" << i << "]" << "[" << j << "] = ";
            cin >> mass[i][j];
        }
    }
    cout << "Massiv: " << endl;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cout << setw(3) << mass[i][j] << setw(3);
        }
        cout << endl;
    }
    int sum = 0;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (mass[i][j] % 2 == 0)
            {
                sum += mass[i][j];
            }
        }
    }
    cout << "sum = " << sum << endl;
    double sr = 0;
    for (int i = 0; i < n; i++)
    {
        sr += mass[i][2];
    }
    sr /= n;
    cout << "sr = " << sr << endl;
}