//dualNumber.h
#pragma once
class CDualNumber {
private:
    double m_real;
    double m_dual;
public:
    CDualNumber(double, double);
    double Real() const;
    double Dual() const;
};


//dualNumber.cpp

#include "dualNumber.h"
using namespace std;

class CDualNumber  {
  private:
      double m_real;
      double m_dual;
  public:
     CDualNumber (double real = 0.0, double dual = 0.0) :  m_real(real), m_dual(dual) {  }
    double Real () const { return m_real; }
    double Dual () const { return m_dual; }
};