Initialized by specifying bracketed values for each row. This is an array with 2 rows and 3 columns.

#include <iostream>
using namespace std;

int main()
{
    int x[2][3] = 
    
    {
        {2, 3, 4}, 
    //Row 1
        {8, 9, 10}
    //Row 2    
    };
    
    cout << x[0][2] << endl;

    return 0;
}

4