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Interview Questions on Inheritance in C++ : (10)

Question: 1

#include<iostream>

class X
{
public: X()
        { std::cout<<"X"; }
        ~X()
        { std::cout<<"~X"; }
};

class Y : public X
{
public: Y()
        { std::cout<<"Y"; }
        ~Y()
        { std::cout<<"~Y"; }
};

int main()
{
    Y obj;
    return 0;
}

(A) XY~X~Y
(B) XY~Y~X
(C) X~XY~Y
(D) X~X~YY

Compiler
Level: Expert Category: inheritance
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Question: 2

How many Access specifier are there in C++?

(A) 1
(B) 2
(C) 3
(D) 4

Compiler
Level: Beginner Category: inheritance
[Posted by: | ]

Question: 3

The public access specifier is used to protect important data

(A) TRUE
(B) FALSE

Compiler
Level: Beginner Category: inheritance
[Posted by: | ]

Question: 4

Which of following allows us to create new classes based on existing classes

(A) Polymorphism
(B) Inheritance
(C) Function overloading
(D) None of these

Compiler
Level: Practitioner Category: inheritance
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Question: 5

More than one class may be derived from a base class

(A) True
(B) False

Compiler
Level: Beginner Category: inheritance
[Posted by: | ]

Question: 6

Polymorphism means the ability to take many forms

(A) True
(B) False

Compiler
Level: Beginner Category: inheritance
[Posted by: | ]

Question: 7

In the following statement, what is the derived class?
class Car : protected Vehicle

(A) Car
(B) Vehicle
(C) protected
(D) None

Compiler
Level: Beginner Category: inheritance
[Posted by: | ]

Question: 8

#include<iostream>
using namespace std;

class Country{
private: int population;

public: void setPopulation(int pop){
             this->population = pop;
          }
         int getPopulation(){
             return this->population;
         }
};

class USA: private Country{

};

int main(){
USA obj;
obj.setPopulation(100);
cout<<obj.getPopulation();
return 0;
}

(A) 100
(B) 0
(C) Compilation Error
(D) Garbage Value is printed

Compiler
Level: Expert Category: inheritance
[Posted by: | ]

Question: 9

// find the output of below program if user enters: 2 2 2
#include<iostream>
using namespace std;

class Rectangle
{
protected:
int length,width,area;
public:
void getdata()
{
cout<<"enter data :";
cin>>length>>width;
}
void print()
{
area=length*width;    
cout<<area;

}
};

class cube : public Rectangle
{
int height,volume;
public:
void getdata()
{
cout<<"enter height, length,width : ";
cin>>height>>length>>width;
}
void dprint()
{
volume=length*height*width;    
cout<<volume;
}
};

int main()
{
cube c;
c.getdata();
c.print();
c.dprint();
return 0;
}

(A) 08
(B) 04
(C) 84
(D) 48

Compiler
Level: Practitioner Category: inheritance
[Posted by: | ]

Question: 10

//find the output of below c++ program

#include<iostream>
using namespace std;

class base{
    public: 
    void hello(){
        cout<<"base";
    }
};

class derived: private base{
    
};

int main()
{
derived obj;
obj.hello();
return 0;
}

(A) base
(B) Nothing is printed
(C) basebase
(D) None of the Above

Compiler
Level: Practitioner Category: inheritance
[Posted by: | ]

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Interview Questions on Inheritance in C++ : (10)

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