Question

Please add //comments to the header file below.

#ifndef CIRCLE_H_INCLUDED
#define CIRCLE_H_INCLUDED
#include <iostream>

using namespace std;

class Circle

{

private:

double radius;

// declaration of public methods in header file
public:

Circle()

{
// default value
radius = 1;

}

void input()

{

cout << "Enter radius: ";

cin >> radius;

}

void print()

{

double PI = 3.14159;

double area = PI * radius * radius;

double circumference = 2 * PI * radius;

cout << "Circle with radius = " << radius << ", area = " << area

<< ", circumference = " << circumference << endl;

}

};

#endif // CIRCLE_H_INCLUDED

Answer 1

#ifndef CIRCLE_H_INCLUDED
#define CIRCLE_H_INCLUDED
#include <iostream>
using namespace std;
class Circle        // Circle class
    {
private:
    double radius;      // private variable radius to hold radius of the circle
    // declaration of public methods in header file
public:
    Circle()            // default constructor which initializes radius to 1
    {
        // default value
        radius = 1;
    }
    void input()        // input method which reads a value into radius variable
    {
        cout << "Enter radius: ";
        cin >> radius;
    }
    void print()        // print method to print radius, area and circumference of the circle
    {
        double PI = 3.14159;
        double area = PI * radius * radius;         // calculate area of circle
        double circumference = 2 * PI * radius;     // calculate circumference circle
        cout << "Circle with radius = " << radius << ", area = " << area    // print circle details
             << ", circumference = " << circumference << endl;
    }
};
#endif // CIRCLE_H_INCLUDED