// Test the equal/not equal operations, one of the types must be a subtype of the other

class Main {
	void main() {
		C1 c1;
		C2 c2;
		C3 c3;
		Object o1, o2;
		boolean s;

		o1 = new Object();
		o2 = new Object();
		c1 = new C1();
		c2 = new C2();
		c3 = new C3();
		
		s = o1 == o2;
		s = c1 != c2;
		s = c3 == c1;
		s = o2 != o1;
		s = null == c2;
		s = o1 == c2;
		//s = null == o;
	}
}

class C1 {}

class C2 extends C1{}

class C3 extends C2{}