Inherit protected fields : class hierarchy « Class « C++ Tutorial

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2. Class
3. class hierarchy

#include <iostream>
using namespace std;

class MyType {

protected:
       float value;

public:
         float remove(float);
         float add(float);
         void display();
         MyType();
};


MyType::MyType()
{
   value = 1000;
}

float MyType::remove(float amount)
{

    value -= amount;
       return value;
}
float MyType::add(float amount)
{
    value += amount;
       return value;
}

void MyType::display()
{
  cout << "Your value is " << value << endl;
}

class DerivedType:public MyType
{


};

DerivedType myDerivedType;

int main()
{
  float amount, value;

  myDerivedType.display();
  cout << endl;

  cout << "Please enter the amount to add \n";
  cin>> amount;
  value = myDerivedType.add(amount);
  cout << "New value is " << value << endl;
  cout << endl;

  cout << "Please enter the amount to remove \n";
  cin >> amount;
  value = myDerivedType.remove(amount);
  cout << "New value is " << value << endl;
  cout << endl;

  return 0;
}

Your value is 1000

Please enter the amount to add
123
New value is 1123

Please enter the amount to remove
123
New value is 1000