#include <cstdio>

class manko1
{
public:
	double x;
};

class manko2 : public manko1
{
public:
	manko2(double x) : manko1(manko1{ x })
	{
	}
};

auto main() -> int
{
	manko2 i(3.14);
	std::printf("%lf\n", i.x);
}