Program Circle Class to calculate circumference and display Maximum Circumference

#include<iostream>

using namespace std;

class circle

{

                private :

                                float radius;

                public:

                void setrad(float r1)

                {

                                radius = r1;

                }

                float getarea()

                {

                                return (3.14 * radius * radius);

                }

                void circum()

                {

                                cout<<"\nCircumfrence = "<<2 * 3.14 * radius<<endl;

                }

};

int main()

                {

                circle c,c1;

                float r1,r2;

                cout<<"Enter Radius: ";

                cin>>r1;

                c.setrad(r1);

                c.circum();

                cout<<"\nEnter 2nd Radius: ";

                cin>>r2;

                c1.setrad(r2);

                c1.circum();

                cout<<"\nMax Circumfrence";

                if(c.getarea()>c1.getarea())

                                c.circum();

                else

                                c1.circum();

                } 

Output

Calculate Circumference With Function

#include<iostream.h>

#include<conio.h>

float area(int&);

float Circumference(int&);

void main()

{

 clrscr();

 int r;

 float a;

 cout<<"enter radius=";

 cin>>r;

 a=area(r);

 cout<<"area="<<a<<endl;

 a=Circumference(r);

 cout<<"Circumference ="<<a<<endl;

 getch();

}

//Area function

float area(int&r)

{

  float a;

  return a=r*r*3.14;

}

//Circumference function

float Circumference(int&r)

{

  float a;

  return a=2*3.14*r;

}