class Program
{
static void Main(string[] args)
{
int a = 4, b = 9;
Swap( a, b);
Console.WriteLine("a = {0}, b = {1}", a, b);
Console.ReadLine();
}
public static void Swap( int a, int b)
{
int temp = a;
a = b;
b = temp;
}
}
}