Code for calculating circle Area and Circumference

Code for calculating circle Area and Circumference

//  This program calculate the area and circumference of the circle by declaring a class

//  Including header files in the program.
#include <iostream>

using namespace std;
// defining a macro for the value of PI
#define PI 3.14

//  Beginning of the class Circle
class Circle {
   
   
    //  declaring public members of the class
    public:
       
       double radius;    //    only data member of the class
      
       //       declaration of public member functions of the class
      
       Circle();            //  default constructor
      
       Circle(double);       //  Parameterized constructor
      
       double CalculateArea();       // calculates area of the circle and then returns
      
       double CalculateCircum();//       calculates circumference of the circle
      
       void Display();       //       displays the area and circumference of the screen
      
};

//       end of class

//  definition of default constructor of class
Circle::Circle()      
{
    radius = 0.0;   // assignning default value to the data member radius
}

//    definition of parameterized constructor of the class
Circle::Circle(double rad)
{
    radius = rad;
}

//    definition of the function for area calculation of the circle
double Circle::CalculateArea()
{
    return (PI * radius * radius);  //  calculating area and then returning it the caller function
}

//    definition of the function for calculating circumference of the circle
double Circle::CalculateCircum()
{
    return ( 2 * PI * radius ); //  calculating and returning the circumferencr to the caller function
}

//    definition of display() function
void Circle::Display()
{

   
    cout<<"nRadius of Circle:tt"<<radius;
    cout<<endl<<endl;
   
    cout<<"Area of Circle:ttt"<<CalculateArea();
    cout<<endl<<endl;
   
    cout<<"Circumference of Circlett"<<CalculateCircum();
    cout<<endl<<endl;   

}

//    beginning of the main() function
main()
{
    Circle C1, C2(3.5);     // declaring two objects of class student
   

    //    for each object created, displaying the information on the screen
    C1.Display();   
    C2.Display();   
 

    system("pause");    // system function to halt the output screen
}