Program to compute Area & circumference of circle

    # include <iostream.h>
    # include<conio.h>
    void computecircle(float*,float*, float );
    void main( )
    {
        float a,c,r;
        cout<<"\n Enter the radius : ";
        cin>>r;
        computecircle(&a,&c,r);
        cout<<"n The area of a circle of radius "<<r<<" is "<<a
            <<"\n and its circumference is " <<c<<endl;
    }
    void computecircle(float *area, float *circ, float r )
    {
           const double PI=3.141592653589793;
           *area = PI*r*r;
           *circ = 2*PI*r;
       }