double min(const double a, const double b) {
	if (a > b) return b;
	return a;
}

double max(const double a, const double b) {
	if (a > b) return a;
	return b;
}

double min(const double a, const double b, const double c) {
	if ((b < a) && (c < a))			return min(b, c);	// a is the greatest
	if ((a < b) && (c < b))			return min(a, c);	// b is the greatest
	/*if ((a < c) && (b < c))*/	return min(a, b);	// c is the greatest
}

double max(const double a, const double b, const double c) {
	if ((b > a) && (c > a))			return max(b, c);	// a is the smallest
	if ((a > b) && (c > b))			return max(a, c);	// b is the smallest
	/*if ((a > c) && (b > c))*/	return max(a, b);	// c is the smallest
}

double SecondMin(const double a, const double b, const double c, const double d) {
	if ((b > a) && (c > a) && (d > a))		return min(b, c, d);	// a is smallest
	if ((a > b) && (c > b) && (d > b))		return min(a, c, d);	// b is smallest
	if ((a > c) && (b > c) && (d > c))		return min(a, b, d);	// c is smallest
	/*if ((a > d) && (b > d) && (c > d))*/	return min(a, b, c);	// d is smallest
}

double SecondMax(const double a, const double b, const double c, const double d) {
	if ((b < a) && (c < a) && (d < a))		return max(b, c, d);	// a is greatest
	if ((a < b) && (c < b) && (d < b))		return max(a, c, d);	// b is greatest
	if ((a < c) && (b < c) && (d < c))		return max(a, b, d);	// c is greatest
	/*if ((a < d) && (b < d) && (c < d))*/	return max(a, b, c);	// d is greatest
}