#include <stdio.h>
union {
	struct
	{
		float s, t;
	};
	struct
	{
		float x, y;
	};
} test;
int main()
{
	test.x = 5;
	test.y = 10;
	printf("s: %f t: %f\n", test.s, test.t);
	return 0;
}