C#

class base1<br />
{<br />
	public void call ( base1 b )<br />
	{<br />
		b.f( ) ;<br />
	}<br />
<br />
	public virtual void f( )<br />
	{<br />
		Console.WriteLine ( "In base1" ) ;<br />
	}<br />
}<br />
<br />
class d1 : base1<br />
{<br />
	public override void f( )<br />
	{<br />
		Console.WriteLine ( "In d1" ) ;<br />
	}<br />
}<br />
class d2 : base1<br />
{<br />
	public override void f( )<br />
	{<br />
		Console.WriteLine ( "In d2" ) ;<br />
	}<br />
}<br />
class Class1<br />
{<br />
	static void Main ( string[ ] args )<br />
	{<br />
		base1 b = new base1( ) ;<br />
		d1 o1 = new d1( ) ;<br />
		d2 o2 = new d2( ) ;<br />
<br />
		b.call ( b ) ;<br />
		b.call ( o1 ) ;<br />
		b.call ( o2 ) ;<br />
	}<br />
}

class sample<br />
{<br />
	public void foo( )<br />
	{<br />
		Console.Write ( "In sample.foo" ) ;<br />
	}<br />
}<br />
<br />
class sampleD : sample<br />
{<br />
	protected void foo( )<br />
	{<br />
		Console.Write ( "In sampleD.foo" ) ;<br />
	}<br />
}<br />
<br />
class Class1<br />
{<br />
	static void Main ( string[ ] args )<br />
	{<br />
		sampleD s = new sampleD( ) ;<br />
		s.foo( ) ;<br />
	}<br />
}

class sample<br />
{<br />
	protected int i ;<br />
	public sample( )<br />
	{<br />
		i = 10 ;<br />
	}<br />
}<br />
class sample1 : sample<br />
{<br />
	public sample1( )<br />
	{<br />
		Console.Write ("Hello " + i ) ;<br />
	}<br />
}<br />
class Class1<br />
{<br />
	static void Main ( string[ ] args )<br />
	{<br />
		sample1 s = new sample1( ) ;<br />
	}<br />
}