program to find area of circle making getdata() function as a private function in C++

Prog 22:Write a program to find area of circle making getdata()

function as a private function.

include <iostream.h>
include <conio.h>

class circle

{

int a,r;

public:

void getdata();

void area();

};

void circle::getdata()

{

cout<<"\nenter r";

cin>>r;

}

void circle::area()

{

getdata();

a=3.14*r*r;

cout<<"\n area is"<<a;

}

void main()

{

clrscr();

circle c;

c.area();

getch();

}

Output:

enter r

10

area is314