error array subscript is not an integer code example

Example 1: why a array are not int

int main() {
    int[3] arr = { 11, 22, 33 }; 
}

Example 2: invalid types int int for array subscript c++

template<int numberOfRows, int numberOfColumns>
void printArray(int (&theArray)[numberOfRows][numberOfColumns])
{
    for(int x = 0; x < numberOfRows; x++){
        for(int y = 0; y < numberOfColumns; y++){
            cout << theArray[x][y] << " ";
        }
        cout << endl;
    }
}