Answer to Question #174182 in C++ for Harini.M

Question

Create the class Circle with attribute radius to find the area of circle. Assign the values for data member using copy constructor and display the result. Finally free the resources of data objects using destructor member function. (Note: Area of circle = 3.14 * radius * radius

Answer 1

#include <iostream>
using namespace std;
 
class Circle {
  public: 
 
  Circle(){                            // default constructor
     radius = new double; // Dynamically allocate of memory.
     *radius = 1;
  }
 
  Circle(double r){               // parameterized constructor 
     radius = new double;   // Dynamically allocate t of memory.
     *radius = r;
  }
 
  Circle(const Circle& other) { // copy constructor
     radius = new double;
     *radius = *other.radius;
  }
 
  ~Circle() {                       // destructor
     delete radius;            // free resources of data objects
              }
 
  double area(){               // Member function   
     return 3.14 * (*radius) * (*radius);
  }  
  
  private: 
              double* radius;
};
 
// Main function for the program
int main() {
  double radius;
  cout<<"Enter radius : " ;
  cin >> radius;
              
  Circle myCicle(radius); 
  Circle newCicle(myCicle);           //copy constructor
 
  cout<<endl; 
  cout << "Area myCicle = " << myCicle.area() << endl<<endl;
  cout<<"Copy constructor: "<<endl;
  cout << "Area newCicle = " << newCicle.area() << endl;
  return 0;
}