c++ visual studio express Circle Class. Write a class name Circle, with the clas

Question

c++ visual studio express

Circle Class. Write a class name Circle, with the class declaration in a file called Circle.h and the implementation in a file called Circle.cpp. The class will have two data members, a double that holds the radius of the circle and a double called pi which will be set to the value, 3.14159 (data member cannot be set in the class declaration, pi should not be set via a parameter but set in the constructor). The class must provide the following member functions

Default Constructor – that sets the radius to 0.0

Constructor – that accepts the radius of the circle as an argument

setRadius – a mutator function for the radius variable

getRadius – an accessor function for the radius variable

getArea – calculates and returns (as double) the area of the circle using the formula

area = pi * radius * radius

getDiameter – calculates and returns (as double) the diameter of the circle using the formula

diameter = radius * 2

getCircumference – calculates and returns (as double) the circumference of the circle using the formula

circumference = 2 * pi * radius

Write a program that demonstrates the Circle class by asking the user for the circle’s radius and creating a Circle object and then reporting the circle’s area, diameter and circumference. Two objects need to be created each using one of the two constructors (showing that both work along with the mutators and accessors).

Explanation / Answer

#include<iostream>
#include "Circle.h"
using namespace std;
int main()
{
double radius;
cout<<"Enter the radius of the circle: ";
cin>>radius;
Circle c1;
cout<<"radius of the circle: "<<c1.getRadius()<<endl;
c1.setRadius(radius);
cout<<"area of the circle: "<<c1.getArea()<<endl;
cout<<"Diameter of the circle: "<<c1.getDiameter()<<endl;
cout<<"Circumference of the circle: "<<c1.getCircumference()<<endl;


Circle c2(radius);  
cout<<"radius of the circle: "<<c1.getRadius()<<endl;
  
return 0;
}

#ifndef Circle_H
#define Circle_H
#endif
class Circle
{
private:
double radius;
double pi;



public:
Circle() {
radius=0.0;
pi=3.14159;
}
Circle(double r){
radius=r;
}

void setRadius(double r){
radius=r;
}

double getRadius() { return radius; }
double getArea(){
double area;
area=pi*(radius*radius);
return area;
}
double getDiameter(){
double dia;
dia=2*(radius);
return dia;
}
double getCircumference(){
double circum;
circum=2*pi*radius;
return circum;
}
};

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