Area overloded

#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);
 }