Program To Find Area of Circle Using Static Member Function In C++

#include<iostream.h>

#include<conio.h>

class test

{

                                    private:           //static Data Member   
static int a;

                              static float pi;       // Static Data Member

public:

                          void static display()        // Static Member 
Function

{

cout<<"\n Main Class Value is="<<pi*a*a;

}

} ;

float test :: pi = 3.14;   // Static Data Member Initialization

int test :: a = 5;   //Static Data Member Initialization

main()

{

clrscr();

test t1;

t1.display();

getch();

}