#include <iostream>
#include <cstdlib>
#include <ctime>
#include <iomanip>
int main()
{
using namespace std;
const int sizeX = 3, sizeY = 4;
float tab[sizeX][sizeY];
srand(time(NULL));
for (int i = 0; i<sizeY; i++)
{
for (int j = 0; j<sizeX; j++)
{
tab[j][i] = rand() % 5;
cout << setw(2) << tab[j][i] << " ";
}
cout << endl;
}
float sum = 0;
int nr_col = 2; // trzecia kolumna {0, 1, >2<, 3}
for (int i = 0; i<sizeY; i++)
{
sum += tab[nr_col][i];
}
std::cout << sum << "\n";
}