#include <err.h>
#include <sched.h>
#include <stdio.h>
#include <unistd.h>

int
main(void)
{
	volatile double x = 1;
	register double y = 2*x;

	fprintf(stderr, "before %f\n", y);
	switch (fork()) {
	case -1:
		err(1, "fork");
	case 0:
		fprintf(stderr, "child %f\n", y);
		return 0;
	default:
		fprintf(stderr, "parent %f\n", y);
		return 0;
	}
}