#include <iostream>
using namespace std;
void swap(int &x,int &y)
{
	int t=x;
	x=y;
	y=t; 
}
void swap(double &x,double &y) 
{
	double t=x;
	x=y;
	y=t; 
}
int main()
{
	int a=3, b=5, c=10, d=20;
	double e=1.3 ;
	double f=3.6;
cout<<"a="<<a<<" b="<<b<<endl;
cout<<"c="<<c<<" d="<<d<<endl;
cout<<"e="<<e<<" f="<<f<<endl;
swap (a,b);
swap (c,d);
swap(e,f);
cout<<"a="<<a<<" b="<<b<<endl;
cout<<"c="<<c<<" d="<<d<<endl;
cout<<"e="<<e<<" f="<<f<<endl;
return 0;
}