tut_21_b.cpp

#include<iostream>
using namespace std;
 
class Circle
{  
    // private data member
    private:
        double radius;
      
    // public member function   
    public:   
        void setData(double r)
        {   // member function can access private
            // data member radius
            radius = r;
             
            double area = 3.14*radius*radius;
             
            cout << "Radius is: " << radius << endl;
            cout << "Area is: " << area;
        }
     
};
 
// main function
int main()
{  
    // creating object of the class
    Circle obj;
     
    // trying to access private data member
    // directly outside the class
    obj.setData(1.5);
        
    return 0;
}