// x == y <==> cmp(x, y) == 0
// x != y <==> cmp(x, y) != 0
// x < y <==> cmp(x,y) < 0
// ...

#include <math.h>

const double EPS = 1.0e-10

int cmp(double x, double y) {
	if (fabs(x-y)<EPS) {
		return 0;
	} else if (x>y) {
		return 1;
	} else {
		return -1;
	}
}