阅读下列程序，写出运行结果：

#include <iostream>
using namespace std;
template <typename T>
void fun( T &x, T &y )
{
T temp;
   temp = x;  x = y;  y = temp;
}
int main()
{
int i , j;
  i = 10; j = 20;
  fun( i, j );
  cout << "i = " << i << '\t' << "j = " << j << endl;
  double a , b;
  a = 1.1; b = 2.2;
  fun( a, b );
  cout << "a = " << a << '\t' << "b = " << b << endl;
}