Polymorphism in C++

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Question 1

Which of the following is true about virtual functions in C++.

A
Virtual functions are functions that can be overridden in derived class with the same signature.
B
Virtual functions enable run-time polymorphism in a inheritance hierarchy.
C
If a function is \'virtual\' in the base class, the most-derived class\'s implementation of the function is called according to the actual type of the object referred to, regardless of the declared type of the pointer or reference. In non-virtual functions, the functions are called according to the type of reference or pointer.
D
All of the above

Question 2

Output of following program

#include
using namespace std;

class Base
{
public:
    virtual void show() { cout<<" In Base \\n"; }
};

class Derived: public Base
{
public:
    void show() { cout<<"In Derived \\n"; }
};

int main(void)
{
    Base *bp, b;
    Derived d;
    bp = &d;
    bp->show();
    bp = &b;
    bp->show();
    return 0;
}

A
```
In Base 
In Base 
```
B
```
In Base 
In Derived
```
C
```
In Derived
In Derived
```
D
```
In Derived
In Base 
```

Question 3

In C++ inheritance, which constructor is called first when an object of a derived class is created?

A
Derived class constructor
B
Base class constructor
C
Constructors are called randomly
D
t depends on access specifier

Question 4

Can a destructor be virtual? Will the following program compile?

#include 
using namespace std;
class Base {
public:
  virtual ~Base() {}   
};
int main() {
   return 0;
}

A
Yes
B
No

Question 5

Which of the following statements are true regarding C++?

(a) Overloading gives the capability to an existing operator to operate on other data types.

(b) Inheritance in object oriented programming provides support to reusability.

(c) When object of a derived class is defined, first the constructor of derived class is executed then constructor of a base class is executed.

(d) Overloading is a type of polymorphism.

Choose the correct option from those given below:

A
(a) and (b) only
B
(a), (b) and (c) only
C
(a), (b) and (d) only
D
(b), (c) and (d) only

Question 6

What is polymorphism in OOP?

A
The ability of a class to inherit from multiple classes
B
The ability to redefine methods in derived classes
C
The ability to use the same interface for different data types
D
The ability to hide the implementation details of a class

Question 7

How run-time polymorphisms are implemented in C++?

A
Using Inheritance
B
Using Friend functions
C
Using Templates
D
Using Virtual Functions

Question 8

Which of the following is a static polymorphism mechanism?

A
Function overloading
B
Operator overloading
C
Templates
D
All of the mentioned

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C++

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