Question

c++
Which one of the following is the correct way to declare a pure virtual function?
O A. virtual void Display(vold)0);
OB. virtual vold Display = 0;
OC. virtual vold Display(vold) = 0;
D. void Display(vold) = 0;
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Answer 1

Answer:

B is the crrct answer

Explanation:

brainlest answer mark it

Answer 2

Answer:

Option b is the correct answer.

B. virtual void Display = 0;

Explanation:

Virtual Function

• A virtual function is a member function that is declared within a parent class and is re-defined by a child class.
• When you refer to a derived class object using a pointer to the parent class, you can call a virtual function for that object and execute the child class’s version of the function.
• They ensure that the correct function is called for an object, regardless of the type of reference used for the function call.
• The virtual function makes it possible to achieve Runtime polymorphism

• Functions are declared with a virtual keyword in the parent class.

There are the following rules that must be obeyed for creating a virtual function:

1. It cannot be declared with the static keyword.
2. A virtual function can be a friend function of another class.
3. Virtual functions should be accessed using a pointer of the parent class type to achieve runtime polymorphism.
4. The signature of virtual functions should be the same in the parent as well as the child class.

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