static void Main(string[] args)
{
Crow c = new Crow();
Sparrow s = new Sparrow();
Console.Write(c.Name + " : ");
c.Sing();
Console.Write(s.Name + " : ");
s.Sing();
}
static void Main(string[] args)
{
Bird[] b = new Bird[2];
b[0] = new Crow();
b[1] = new Sparrow();
for (int i = 0; i < b.Length; i++)
{
Console.Write(b[i].Name + " : ");
b[i].Sing();
}
}
