incomplete q10_2

#include <iostream>
using namespace std;

class ICalculator
{
public:

    virtual int calculate(int x,int y) = 0;
};

class Adder : public ICalculator
{
public:
    int Calculate(int x,int y)
{
    int s;
    s=x+y;
    return s;
}

};


class Multiplier : public ICalculator
{
public:
    int Calculate(int x, int y)
    {
        int m;
        m=x*y;
        return m;
    }
};

class Problem
{
private: int m_x ;
         int m_y ;

         ICalculator* m_pCalculator;

public:  int calculate();
         setX(int);
         setY(int);
         setCalculator(ICalculator*);