CPP Program to calculate area and volume of sphere

/*   Write Program to calculate are and volume of sphere using C++ OR CPP  */

#include<iostream.h>
#include<conio.h>
float area(float);
float volume(float);
void main()
{
float r,a,v;
clrscr();
cout<<"Program to calculate area and volume of sphere";
cout<<"\nEnter radius:";
cin>>r;
a=area(r);
v=volume(r);
cout<<"\nThe area is:"<<a;
cout<<"\nThe volume is:"<<v;
getch();
}
float area(float n)       ///////calculate area
{
float ans;
ans=4*3.14*n*n;
return(ans);
}
float volume(float n)     //////calculate volume
{
float ans1;
ans1=4/3*3.14*n*n*n;
return(ans1);
}