#include <iostream>
using namespace std;

class Matrix{
protected:
	double number;
public:
	Matrix(double n):number(n){
		///....
	}
	inline std::string toString()
	{
	    return to_string(number);
	}
};

int main() {
	Matrix m = 10.2;
	cout << m.toString();
	return 0;
}