/*************************************************************************
 *  Compilation:  javac Gate.java
 *  Execution:    java Gate
 *  Dependencies: And.java Or.java Not.java
 *
 *  Superclass for logic gates.
q *
 *************************************************************************/


abstract class Gate {
    abstract public boolean signal();

    public static void main(String[] args) {
        Input in0 = new Input();
        Input in1 = new Input();
        Input in2 = new Input();
        Gate and = new And(in0, in1);
        Gate not = new Not(in2);
        Gate or  = new Or (and, not);
        
        in0.turnOn();
        in1.turnOn();
        in2.turnOn();
        System.out.println(or.signal());

        in0.turnOff();
        in1.turnOn();
        in2.turnOn();
        System.out.println(or.signal());

        in0.turnOff();
        in1.turnOff();
        in2.turnOff();
        System.out.println(or.signal());

    }
}