#include <iostream>

using namespace std;

class Matrix2x2
{
public:
    Matrix2x2() : n({{3,1},{4,7}}) {}
    void setVal(int row, int col, double newVal);
    double n[2][2];
};

int main() {
	Matrix2x2 m;
    cout << m.n[0][0] << endl;
    cout << m.n[0][1] << endl;
    cout << m.n[1][0] << endl;
    cout << m.n[1][1] << endl;
	return 0;
}