#include <iostream>
using namespace std;
void input(int a[4][4])
{
    cout << "Input array:" << endl;
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            cout << "a[" << i << "][" << j << "]=";
            cin >> a[i][j];
        }
    }
}
void diagcheck(int a[4][4])
{
    int countcheck = 0;
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            if (i==j)
            {
                if (a[i][j] != 0)
                {
                    countcheck++;
                }
            }
        }
    }
    if (countcheck != 0)
    {
        cout << "Ima elementi ot glavniq diagonal, koito ne sa ravni na nula!" << endl;
    }
    else
    {
        cout << "Vsichki elementi ot glavniq diagonal sa ravni na nula!" << endl;
    }
}
    void main()
    {
        int a[4][4];
        input(a);
        diagcheck(a);
        system("pause");
    }