#include <iostream>

class CLASS_ {
public :
  CLASS_() : data { 5, 6 } {}
  CLASS_(int x, int y) : data { x, y } {}
  struct DATA{
    int x;
    int y;
  };
  DATA data;
};

int main()
{
  CLASS_ c1, c2(10, 20);
  std::cout << c1.data.x << "," << c1.data.y << std::endl
            << c2.data.x << "," << c2.data.y << std::endl;
}