protected static Gate GenerateGate(string type)
        {
            Gate gate = null;

            if (type.Equals("AND", StringComparison.OrdinalIgnoreCase))
            {
                gate = new AndGate();
            }
            else if (type.Equals("OR", StringComparison.OrdinalIgnoreCase))
            {
                gate = new OrGate();
            }
            else if (type.Equals("NOT", StringComparison.OrdinalIgnoreCase))
            {
                gate = new NotGate();
            }
            else if (type.Equals("XOR", StringComparison.OrdinalIgnoreCase))
            {
                gate = new XorGate();
            }
            else if (type.Equals("NAND", StringComparison.OrdinalIgnoreCase))
            {
                gate = new NandGate();
            }
            else if (type.Equals("NOR", StringComparison.OrdinalIgnoreCase))
            {
                gate = new NorGate();
            }
            else if (type.Equals("BUFFER", StringComparison.OrdinalIgnoreCase))
            {
                gate = new BufferGate();
            }
            else if (type.Equals("OUTPUT", StringComparison.OrdinalIgnoreCase))
            {
                gate = new OutputOnlyGate();
            }
            else if (type.Equals("TRUE", StringComparison.OrdinalIgnoreCase))
            {
                gate = new AlwaysTrueGate();
            }
            else if (type.Equals("FALSE", StringComparison.OrdinalIgnoreCase))
            {
                gate = new AlwaysFalseGate();
            }
            else if (type.Equals("INPUT", StringComparison.OrdinalIgnoreCase))
            {
                gate = new InputOnlyGate();
            }
            else if (type.Equals("CLOCK", StringComparison.OrdinalIgnoreCase))
            {
                gate = new ClockGate();
            }

            return(gate);
        }
        public override Gate Clone()
        {
            Gate clone_gate = new AlwaysTrueGate();

            return(clone_gate);
        }