using System;

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namespace AbstractClasses

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{

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public class program

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{

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 public static void Main(string[] args)

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 {

tiger tiger= new tiger();

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Console.WriteLine(tiger.Describe());

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Console.Read();

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}

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}

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abstract class fourleggedanimal

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{

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public virtual string Describe()

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{

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 return "This animal has  fourlegs ";

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 }

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}

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class tiger : fourLeggedBirdanimal

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{

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    public override string Describe()

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{

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string result = base.Describe();

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result+= "Infact, it's a tiger!";

return result;}

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}

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}

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​