What are virtual and pure virtual functions?

Question

Ashutosh Kumar Verma · Answer

Virtual Function -and  and  and  Virtual function is member function of class. It is declare with ' virtual' keyword in base class and also we provideand  its definitionand  in same class. It is access in derived class by using 'override' keyword to change its statements as requirement.and  Virtual function can not declare in abstract class and can be instantiate that base class which contain virtual method. All virtual methods may or may not be redefined derived class.and 
 public class VirtualClass    {        public virtual void Get()
        {
            Console.WriteLine('Base class');
        }    }
    public class Derived : VirtualClass
    {
    public override void Get()
    {
        Console.WriteLine('Derived class');
    }
    }
    class VirtualExp
    {
        static void Main(string[] arg)
        {
            VirtualClass virtu = new VirtualClass();
            virtu.Get();
            Derived der = new Derived();
            der.Get();        }    }
Output- and Base class
and  and  and  and  and Derived class
Pure Virtual function -and  and  Pure virtual function is like a virtual function defines with 'virtual' keyword in the base class. It has no definition in same class. Pure virtual function is declare in base class with assigning 0(zero). In which class it declared that class is abstract class so that class can not be instantiate. All pure virtual function will must redefined in derived class to provide its body.
and  and  and  abstract class PureVirtual
and  and  and  and  {
and  and  and  and  and  and  and public abstract void Gett();         
and  and  and  and  }
and  and  and  and  class Pure :PureVirtual
and  and  and  and  {
and  and  and  and  public override void Gett()
and  and  and  and  {
and  and  and  and  and  and  Console.WriteLine('Pure Virtual function is override');
and  and  and  and  }
and  and  and  and  }
and  and  and  and  class VirtualTest
and  and  and  and  {
and  and  and  and  and  and  static void Main(string[] arg)
and  and  and  and  and  and  {
and  and  and  and  and  and  Pure p=new Pure();
and  and  and  and  and  and  and  and  p.Gett();
and  and  and  and  and  and  }
and  and  and  and  }
Output- Pure Virtual function is override

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What are virtual and pure virtual functions?

Ravi Vishwakarma

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