#include <iostream>

struct coordinate_2d
{
	double x;
	double y;
};

void print_coordinate(coordinate_2d &q);

int main()
{
	coordinate_2d ball_center = {4, 3};

	ball_center.x = ball_center.y / 2;

	print_coordinate(ball_center);
	print_coordinate(ball_center);
}

void print_coordinate(coordinate_2d &q)
{
	cout << "The x center is " << q.x << endl;
	cout << "The y center is " << q.y << endl;
	q.x = 47;
}