QUESTION 2

#include <iostream>
using namespace std;

class ILogic{
public:
	virtual long Compute(long input1, long input2) = 0;
};

class XOR :public ILogic{
public:
	long Compute(long input1, long input2){
		return input1 ^ input2;
	}
};

class NOR :public ILogic{
public:
	long Compute(long input1, long input2){
		return ~(input1 | input2);
	}
};

class NAND :public ILogic{
public:
	long Compute(long input1, long input2){
		return ~(input1 & input2);
	}
};

class Logic{
	ILogic *m_pObject;
	long m_Input1, m_Input2;
public:
	void SetAttributes(long in1, long in2){
		m_Input1 = in1;
		m_Input2 = in2;
	}
	void SetLogicObject(ILogic *pObject){
		m_pObject = pObject;
	}
	void ComputeLogic(long &result){
		result = m_pObject->Compute(m_Input1, m_Input2);
	}
};

// Note: Implement parts (a) & (b) as per the requirements of QUESTION_2.
int main()
{
	int type;
	long in1, in2, result;
	ILogic *a = NULL;
	Logic b;
	while(1){
		cout << "Specify a logic operation" << endl << "(0 --> XOR, 1 --> NOR, 2 --> NAND, -1 --> exit): ";
		cin >> type;
		if (type == -1){
			cout << endl << "Program terminated." << endl;
			return 0;
		}
		if (type == 0 || type == 1 || type == 2){
			cout << endl << "Enter two integer logic inputs: ";
			cin >> in1 >> in2;
			if (type == 0){
				a = new XOR;
				b.SetAttributes(in1, in2);
				b.SetLogicObject(a);
				b.ComputeLogic(result);
			}
			else if (type == 1){
				a = new NOR;
				b.SetAttributes(in1, in2);
				b.SetLogicObject(a);
				b.ComputeLogic(result);
			}
			else if (type == 2){
				a = new NAND;
				b.SetAttributes(in1, in2);
				b.SetLogicObject(a);
				b.ComputeLogic(result);
			}
			cout << endl << "Output: " << result << endl << endl;
		}
		else
			cout << endl << "Invalid Input" << endl << endl;
	}
	return 0;
}