Program that takes three radii of circles and displays their areas

#include "stdafx.h"

#include "conio.h"

#include "stdio.h"

#include "iostream"

using namespace std;

void Area_1();

void Area_2();

void Area_3();

int _tmain(int argc, _TCHAR* argv[])

{

        Area_1();

        Area_2();

        Area_3();

        getch();

}

void Area_1()

{

       float a,r,p;                  ////// a is area , r is radius and p is pi ( 3.14 )

       p=3.14;

       cout<<"enter radius1"<<endl;

       cin>>r;

       a=p*r*r;

       cout<<"a1="<<a<<endl;

}

void Area_2()

{

       float a,r,p;

       p=3.14;

       cout<<"enter radius2"<<endl;

       cin>>r;

       a=p*r*r;

       cout<<"a2="<<a<<endl;

}

void Area_3()

{

       float a,r,p;

       p=3.14;

       cout<<"enter radius3"<<endl;

       cin>>r;

       a=p*r*r;

       cout<<"a3="<<a<<endl;

}