#include <stdio.h>

typedef struct Point
{
	double x;
	double y;
} point;

int main()
{
	point t[3];
	int i;

	for (i = 0; i < 3; i++)
	{
		t[i].x = i;
		t[i].y = 2 * i;
		printf("%lf %lf\n", t[i].x, t[i].y);
	}
}