C++ Program to find the areas of rectangle and a circle using switch case

#include<iostream.h>
   #include<conio.h>
   #define phi 3.14
   int area(int,int);
   float area(int);
   void main()
   {
     int a,b,c,cho;
     clrscr();
     cout<<"\t What do you want to do?\n";
     cout<<"1. area of rectangle"<<endl;
     cout<<"2. area of circle"<<endl;
     cout<<"Choice:";
     cin>>cho;
     switch(cho)
     {
       case 1:
         cout<<"Enter lengt and breath (with white space):";
         cin>>a>>b;
         cout<<"Area of RECTANGLE:"<<area(a,b);
         break;
       case 2:
         cout<<"Enter radius:";
         cin>>c;
         cout<<"Area of CIRCLE:"<<area(c);
         break;
     }
     getch();
   }
   int area(int x,int y)
   {
     return (x*y);
   }
   float area(int s)
   {
     return (phi*s*s);
   }