Question 1

C++ was originally developed by ….......

Accepted Answer

Bjarne Stroustrup is the person who originally developed C++.

Question 2

Which of the following approach is adopted in C++?

Accepted Answer

C++ adopts a bottom-up approach, especially evident in its support for object-oriented programming where developers start with defining the classes (the bottom) and then build up to more complex structures and functionalities.

Question 3

Which feature of C++ contain the concept of super class and subclass?

Accepted Answer

The concept of a superclass and subclass is encapsulated within the feature of inheritance in C++. Inheritance allows a class (subclass) to inherit properties and behaviors from another class (superclass), enabling hierarchical classification.

Question 4

The main intention of using inheritance is ….........

Accepted Answer

Inheritance is primarily used to extend or enhance the functionality of a base class by adding new attributes and methods or modifying existing ones in the derived class, thereby promoting code reusability and hierarchical classification.

Question 5

If particular software can be used in some other application than the one for which it is created then it reveals ….........

Accepted Answer

Data reusability refers to the ability of software components or systems to be used in more than one application or in different scenarios than originally intended, which is what the question describes.

Question 6

Which of the following data type does not return anything?

Accepted Answer

The "void" data type is used in programming languages like C, C++, and Java to specify that a function does not return any value. Unlike int, short, and long, which are used to define variables that can store integers of different sizes, void is used to indicate the absence of a return value.

Question 7

How many objects can be created from an abstract class?

Accepted Answer

An abstract class cannot be instantiated directly, so zero objects can be created from it.

Question 8

Which of the following statements is correct for a static member function?
1) It can access only other static members of its class.
2) It can be called using the class name, instead of objects

Accepted Answer

Static member functions can access only static data members or other static member functions of their class, and they can indeed be called using the class name without creating an instance of the class.

Question 9

What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

Accepted Answer

When a class only has parameterized constructors and does not explicitly define a default (no-argument) constructor, attempting to create an object with a zero-argument constructor call will result in a compile-time error, as the compiler will not be able to find a matching constructor to call.

Question 10

Which of the following interface determines how your program will be used by other program?

Accepted Answer

The 'public' interface determines how your program will be used by other programs, as it allows access to the program's components from outside its own code.

Question 11

What is the difference between struct and class in C++?

Accepted Answer

The primary difference between a struct and a class in C++ is the default access level: members of a struct are public by default, whereas members of a class are private by default. Additionally, the default inheritance access-specifier differs between structs and classes, being public for structs and private for classes. Structures can have constructors, destructors, and virtual functions, contrary to some of the incorrect options provided.

Question 12

Predict the output of following C++ program#include<iostream> using namespace std;class Empty {}; int main(){cout <<sizeof(Empty); return 0;}

Accepted Answer

In C++, even an empty class has a size of at least 1 byte to ensure that each instance of the class has a unique address.

Question 13

class Test { int x;};int main(){Test t; cout <<t.x; return 0;}

Accepted Answer

The answer of class Test { int x;};int main(){Test t;...

Question 14

Which of the following is true?

Accepted Answer

Objects of a class do not share non-static members; each object has its own copy of non-static data members, allowing each to maintain its own state. Non-static methods are shared in the sense that all objects use the same code for these methods, but they operate on their own set of data members.

Question 15

Which of the following is true about the following program#include class Test{public:int i;void get();};void Test::get(){std::cout <<"Enter the value of i: "; std::cin >>i;}Test t; // Global object int main(){Test t; // local object t.get();std::cout <<"value of i in local t: "<

Accepted Answer

The program compiles and runs fine. It demonstrates the use of scope resolution operator (::) to access the global object 't' when there is a local object with the same name.

Question 16

Which of the following is true about new when compared with malloc.
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn't
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Accepted Answer

The answer of Which of the following is true about...

Question 17

Predict the output?#include using namespace std;class Test{int x;Test() { x = 5;}};int main(){Test *t = new Test; cout <x;}

Accepted Answer

The constructor of the class `Test` is private, which means it cannot be accessed outside of the class itself. Attempting to create an instance of `Test` using `new` in the `main` function will result in a compile-time error because the constructor cannot be accessed.

Question 18

What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;

Accepted Answer

Using delete on a NULL pointer has no effect; it is safe and does not cause any error.

Question 19

Is it fine to call delete twice for a pointer?#include<iostream> using namespace std;int main(){int *ptr = new int; delete ptr;delete ptr; return 0;}

Accepted Answer

Calling delete on a pointer that has already been deleted leads to undefined behavior, which can cause a program to crash or behave unpredictably.

Question 20

Which of the followings is/are automatically added to every class, if we do not write our own.

Accepted Answer

All of the mentioned members (copy constructor, assignment operator, and a constructor without any parameter, often referred to as the default constructor) are automatically provided by the compiler if they are not explicitly defined by the programmer. This behavior ensures that objects of the class can be created, copied, and assigned even without explicit definitions of these operations by the programmer.

Quiz 4: C++ Programming and Concepts: Inheritance, Data Types, Objects, and Output Prediction