pure virtual function in c++ - Wikitechy https://www.wikitechy.com/interview-questions/tag/pure-virtual-function-in-c/ Interview Questions Tue, 14 Sep 2021 05:00:58 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png pure virtual function in c++ - Wikitechy https://www.wikitechy.com/interview-questions/tag/pure-virtual-function-in-c/ 32 32 Which type of inheritance needs a virtual function ? https://www.wikitechy.com/interview-questions/programming/which-type-of-inheritance-needs-a-virtual-function/ https://www.wikitechy.com/interview-questions/programming/which-type-of-inheritance-needs-a-virtual-function/#respond Fri, 27 Aug 2021 00:47:53 +0000 https://www.wikitechy.com/interview-questions/?p=2589

Which type of inheritance needs a virtual function ?

A. Multi level inheritance

B. Multiple inheritance

C. Hybrid inheritance

D. All of the above

Answer : D. All of the above

]]> https://www.wikitechy.com/interview-questions/programming/which-type-of-inheritance-needs-a-virtual-function/feed/ 0 Syntax for Pure Virtual Function is ? https://www.wikitechy.com/interview-questions/cpp/syntax-for-pure-virtual-function-is/ https://www.wikitechy.com/interview-questions/cpp/syntax-for-pure-virtual-function-is/#respond Mon, 12 Jul 2021 22:58:10 +0000 https://www.wikitechy.com/interview-questions/?p=388

Syntax for Pure Virtual Function is ?

A. virtual void show()==0

B. void virtual show()==0

C. virtual void show()=0

D. void virtual show()=0

Answer : B. virtual void show()==0

Explanation :

  • In C++, A pure virtual function or abstract function is a virtual function for which we don’t have implementation, we only declare it. A pure virtual function is declared by assigning 0 in declaration.

Syntax

// An abstract class 
class Sample
{    
    // Data members of class 
public: 
    // Pure Virtual Function 
    virtual void show() = 0; 
    
   /* Other members */
};
]]> https://www.wikitechy.com/interview-questions/cpp/syntax-for-pure-virtual-function-is/feed/ 0 Find the wrong statement about Abstract Class ? https://www.wikitechy.com/interview-questions/cpp/find-the-wrong-statement-about-abstract-class/ https://www.wikitechy.com/interview-questions/cpp/find-the-wrong-statement-about-abstract-class/#respond Mon, 12 Jul 2021 22:54:00 +0000 https://www.wikitechy.com/interview-questions/?p=386

Find the wrong statement about Abstract Class ?

A. We can’t create its objects

B. We can’t create pointers to an abstract class

C. It contains at least one pure virtual function

D. We can create references to an abstract class

Answer : B. We can’t create pointers to an abstract class

Explanation :

  • Abstract Class is a class which contains atleast one Pure Virtual function.
  • An abstract class is a class that is designed to be specifically used as a base class.
  • It is used to provide an Interface for its sub classes.
  • Classes inheriting an Abstract Class must provide definition to the pure virtual function, otherwise they will also become abstract class.
  • You declare a pure virtual function by using a pure specifier (= 0) in the declaration of a virtual member function in the class declaration.

Example

class AB {
public:
  virtual void f() = 0;
};
]]> https://www.wikitechy.com/interview-questions/cpp/find-the-wrong-statement-about-abstract-class/feed/ 0 C++ supports run time polymorphism with the help of virtual functions, which is called ______ binding https://www.wikitechy.com/interview-questions/cpp/c-supports-run-time-polymorphism-with-the-help-of-virtual-functions-which-is-called-______-binding/ https://www.wikitechy.com/interview-questions/cpp/c-supports-run-time-polymorphism-with-the-help-of-virtual-functions-which-is-called-______-binding/#respond Mon, 12 Jul 2021 22:49:38 +0000 https://www.wikitechy.com/interview-questions/?p=384

C++ supports run time polymorphism with the help of virtual functions, which is called ______ binding.

A. Dynamic

B. Run time

C. Early binding

D. Static

Answer : A. Dynamic

Explanation :

  • Dynamic binding (dynamic dispatch) means that a block of code executed with reference to a procedure call is determined at run time.
]]> https://www.wikitechy.com/interview-questions/cpp/c-supports-run-time-polymorphism-with-the-help-of-virtual-functions-which-is-called-______-binding/feed/ 0 A virtual function that has no definition within the base class is called ? https://www.wikitechy.com/interview-questions/cpp/a-virtual-function-that-has-no-definition-within-the-base-class-is-called/ https://www.wikitechy.com/interview-questions/cpp/a-virtual-function-that-has-no-definition-within-the-base-class-is-called/#respond Mon, 12 Jul 2021 22:45:35 +0000 https://www.wikitechy.com/interview-questions/?p=380 A virtual function that has no definition within the base class is called ?

A. Pure virtual function

B. Pure static function

C. Pure Const function

D. Virtual Function

Answer : A. Pure virtual function

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