#include <iostream>
#include <string>
using namespace std;

struct Input_Interface {
    struct command_output {
      std::string command;
      void (*output_function)();
    };

    static void Clear();
    static void Quit_loop();
};

void Input_Interface::Clear()
{
	cout << "Clear called" << endl;
}

int main() {
	Input_Interface::command_output t = {"CLEAR", Input_Interface::Clear};
	t.output_function();
	return 0;
}