As you remember, by accessing elements of the array, we can not only print them but also change them. For instance:

int x[2][3] { 
&nbsp;&nbsp;&nbsp;&nbsp;    {1, 2, 3},&nbsp;&nbsp;&nbsp;&nbsp;    
&nbsp;&nbsp;&nbsp;&nbsp;    {4, 5, 6}
}; 
cout << x[0][0] << endl;

x[0][0] = 100;
cout << x[0][0];

Actually, we may not only change elements of the existing array but also set values:

int x[2][2];

x[0][0] = 1;
cout << x[0][0] << " ";

x[1][0] = 2;
cout << x[1][0] << " ";

x[0][1] = 3;
cout << x[0][1] << " ";

x[1][1] = 4;
cout << x[1][1] << " ";

Let's consolidate the acquired knowledge!

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Fill Arrays