Tutorial 10 Q2

//pastebin.com/u/thewhitefang
// Tutorial 10 Q2
#include <iostream>

using namespace std;

class ICalculator{

public:
    virtual int Calculate(int x, int y) = 0;

};

//both Adder and Multiplier derived from ICalculator
class Adder : public ICalculator{
public:
    int Calculate(int x, int y){

        int r;
        r = x + y;

        return r;

    }

};

class Multiplier : public ICalculator{
public:
    int Calculate(int x, int y){

        int r;
        r = x*y;

        return r;

    }
};

//ICalculator lightly associated via m_pCalculator
class Problem{
private:
    int m_x;
    int m_y;

    ICalculator* m_pCalculator;

public:
    int Calculate(){

        return m_pCalculator->Calculate(m_x, m_y);
    };

    //usual setter functions
    void SetX(int inValX)
    {
        m_x = inValX;
    };
    void SetY(int inValY)
    {
        m_y = inValY;
    };

    //setICalculator takes in pointer
    void setICalculator(ICalculator* inVal)
    {
        m_pCalculator=inVal;
    };

};



int main(){

    Problem a;

    //always make heap array for this
    //make for both add and mul
    ICalculator *pAdd = new Adder();
    Adder pAdder; //remember Adder is a class

    ICalculator *pMul = new Multiplier();
    Multiplier pMulti;


    int x;
    int y;
    cout << "Enter X value: ";
    cin >> x;
    cout << "Enter Y value: ";
    cin >> y;

    a.SetX(x);
    a.SetY(y);

    //calls in Adder
    a.setICalculator(&pAdder);
    cout << "Addition result: "<< a.Calculate() << endl;

    //calls in Multiplier
    a.setICalculator(&pMulti);
    cout << "Multiplication result: " << a.Calculate() << endl;



    return 0;
}