CALCULATE VOLUME AND TOTAL AREA OF A CYLINDER

Question: Even though x is private, what can I do to make x available in the derived functions cylinderType?

When I compile the cylinderType program I get the following message:

Line          Message
18            'int circleType::x' is private
94            within this context

This message is repeated several time in the following functions:

float cylinderType::getTotalArea()
{
    return 2 * x * x  * PI * (x  + y);
}

float cylinderType::getVolume()
{
    return PI * x * x + y;
}

cylinderType::cylinderType(int a, int b):circleType(a + b)
{
    x = a;
    y = b;
}


Entire code:

#include <iostream>

using namespace std;

     const float PI = 3.14;

class circleType
{
public:
       void print()const;
       int getX();
       float getArea();      
       float getCircumference();
       circleType();
       circleType(int a);

private:
          int x;          
       
};

class cylinderType: public circleType
{
public:
       void print()const;
       int getY();
       float getTotalArea();      
       float getVolume();
       cylinderType();
       cylinderType(int a, int b = 0);
             
private:
       int y;
       
};


int main()
{
    circleType radiusObject(5);
    cylinderType heightObject(3);    
    radiusObject.print();
    heightObject.print();
   
    cout<<"Circle area = " <<radiusObject.getArea()<<endl;
    cout<<"Circle circumference = " <<radiusObject.getCircumference()<<endl;
    cout<<"Cylinder total area = "<<heightObject.getTotalArea()<<endl;
    cout<<"Cylinder volume = " <<heightObject.getVolume()<<endl;
   
    cin.get();
    return 0;
}


int circleType::getX()
{
    return x;
}


void circleType::print()const
{
     cout<<"r = radius of a circle.  r = "<<x<<", PI = "<<PI<<endl;
     cout<<"Formulas for area of circle = (2 * PI * r * r)"<<endl;
     cout<<"Formulas for circumferencea of circle = (2 * r * PI)"<<endl;

}

void cylinderType::print()const
{

     cout<<"Formula for total area of a cylinder = 2 * r * PI * (r + h)"<<endl;
     cout<<"Formula for volume of a cylinder = PI * r * r * h"<<endl;
}

float circleType::getArea()
{
    return 2 * PI * x * x;
}


float circleType::getCircumference()
{
    return 2 * x * PI;
}

int cylinderType::getY()
{
    return y;
}

float cylinderType::getTotalArea()
{
    return 2 * x * x  * PI * (x  + y);
}

float cylinderType::getVolume()
{
    return PI * x * x + y;
}

circleType::circleType()
{
    x = 0;
}

circleType::circleType(int a)
{
    x = a;
}


cylinderType::cylinderType(int a, int b):circleType(a + b)
{
    x = a;
    y = b;
}