A Program to calculate Area of Circle or Perimeter of Circle as per the User Choice (If- Else Example)

#include<iostream.h>
#include<conio.h>
#include<process.h>
void main()
{
int choice,radius;
cout<<"Enter Radius of Circle\n";

cin>>radius;
cout<<"Enter your choice\n";
cout<<"1. Area of Circle\n";
cout<<"2. Perimeter of Circle\n";
cout<<"3. Exit\n";
cin>>choice;
if(choice==1)
{
   cout<<"Area = "<<3.14*radius*radius;
}
else if (choice==2)
{
   cout<<"Perimeter="<<2*3.14*radius;
}
else if (choice==3)
exit(0);
else
cout<<"Wrong Choice";
getch();
}