Write a circle class that has the following member variables: radius: a double p

Question

Write a circle class that has the following member variables:

           radius: a double

           pi: a double initialized with the value 3.14159

The class should have the following member functions:

Default Constructor: A default constructor that sets radius to0.0

Constructor: 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: Returns the area of the circle, which is calculatedas

           area = pi * radius * radius

getDiameter: Returns the diameter of the circle, which iscalculated as

           diameter = radius * 2

getCircumfrence: Returns the circumference of the circle, whichis calculated as

           circumference = 2 * pi * radius

write a program that demonstrates the Circle class by asking theuser for the circle

Explanation / Answer

#include <iostream>
using namespace std;
class circle
{private:
   double radius;    
   const static double pi=3.14159;
public:
   circle()
      {radius=0.0;
        }
   circle(double r)
      {setRadius(r);
      }
   void setRadius(double r)
      {radius=r;
      }
   double getRadius()
      {return radius;
      }
   double getArea()
      {return pi*radius*radius;
      }
   double getDiameter()
      {return radius*2;
      }
   double getCircumference()
      { return 2.*pi*radius;
       }
};

int main()
{double r;
cout<<"Enter radius: ";
cin>>r;
circle mycircle(r);  
cout<<"A circle with radius "<<mycircle.getRadius()<<" has an"<<endl;
cout<<"area of: "<<mycircle.getArea()<<endl;
cout<<"diameter of: "<<mycircle.getDiameter()<<endl;
cout<<"circumference of: " << mycircle.getCircumference()<<endl;
system("pause");
return 0;
}

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