Question 1

Every class has at least one constructor function, even when none is declared.

Accepted Answer

If a class does not explicitly declare any constructors, the Java compiler automatically provides a no-argument constructor, also known as the default constructor, which initializes the object with default values.

Question 2

What is the difference between struct and class in terms of Access Modifier?
A)by default all the struct members are private while by default class members are public.
B)by default all the struct members are protected while by default class members are private.
C)by default all the struct members are public while by default class members are private.
D)by default all the struct members are public while by default class members are protected.

Accepted Answer

By default, all the members of a struct are public, whereas class members are private if no access modifier is specified. This is a key difference in their behavior, especially in terms of encapsulation and data protection.

Question 3

The default access level assigned to members of a class is              
A)private
B)public
C)protected
D)needs to be assigned

Accepted Answer

In Java, if no access modifier is specified for a class member, the default access level is package-private, which is more restrictive than public but less restrictive than protected and private. However, the closest matching option provided is "private," which is technically incorrect but the best match given the options. The correct term "package-private" or "default" is not listed among the choices.

Question 4

There is nothing like a virtual constructor of a class.

Accepted Answer

The answer of There is nothing like a virtual constructor...

Question 5

Which of the following operators allow defining the member functions of a class outside the class?
A)(::)
B)(?)
C)(:?)
D)(%)

Accepted Answer

The scope resolution operator (::) allows for the definition of a class's member functions outside the class body.

Question 6

Which type of class has only one unique value for all the objects of that same class?
A)this
B)friend
C)static
D)both a and b

Accepted Answer

Static classes or static class members (variables and methods) are shared among all instances of a class, meaning they have the same value for all instances.

Question 7

What is a constructor?
A)a class automatically called whenever a new object of this class is created.
B)a class automatically called whenever a new object of this class is destroyed.
C)a function automatically called whenever a new object of this class is created.
D)a function automatically called whenever a new object of this class is destroyed.

Accepted Answer

A constructor is a special type of function in a class that is automatically called whenever a new object of that class is created. It typically initializes the new object.

Question 8

Under what conditions a destructor destroys an object?
A)scope of existence has finished
B)object dynamically assigned and it is released using the operator delete.
C)program terminated.
D)both a and b.

Accepted Answer

A destructor destroys an object when its scope of existence has finished or when the object dynamically assigned is released using the operator delete. This includes both automatic destruction at the end of scope and manual destruction via delete for dynamically allocated objects.

Question 9

When class B is inherited from class A, what is the order in which the constructers of those classes are called
A)class a first class b next
B)class b first class a next
C)class b's only as it is the child class
D)class a's only as it is the parent class

Accepted Answer

When class B inherits from class A, the constructor of class A (the parent class) is called first, followed by the constructor of class B (the child class). This ensures that the initialization of the parent class is completed before the child class's initialization begins.

Question 10

Which one of the following is not a valid reserved keyword in C++?
A)explicit
B)public
C)implicit
D)private

Accepted Answer

C++ does not have "implicit" as a reserved keyword. "explicit," "public," and "private" are all valid reserved keywords in C++.

Question 11

Variables declared in the body of a particular member function are known as data members and can be used in all member functions of the class.

Accepted Answer

Variables declared within a member function are known as local variables and are only accessible within that function, not in all member functions of the class. Data members are variables declared in the class but outside any member function and can be accessed by all member functions of the class.

Question 12

In a class definition, data or functions designated private are accessible
A)to any function in the program.
B)only if you know the password.
C)to member functions of that class.
D)only to public members of the class.

Accepted Answer

Private members of a class are accessible only to the member functions (methods) of that class, not from outside the class.

Question 13

A member function can always access the data
A)in the object of which it is a member.
B)in the class of which it is a member.
C)in any object of the class of which it is a member.
D)in the public part of its class.

Accepted Answer

A member function can access the data in the object of which it is a member because it operates on the instance of the class it belongs to, allowing it to access both private and public data members of that specific object.

Question 14

Classes are useful because they
A)can closely model objects in the real world.
B)permit data to be hidden from other classes.
C)bring together all aspects of an entity in one place.
D)options a, b and c

Accepted Answer

Classes are a fundamental concept in object-oriented programming, allowing for the modeling of real-world entities by encapsulating data and behaviors, supporting data abstraction and encapsulation, and organizing related data and functions.

Question 15

For the object for which it was called, a const member function
A)can modify both const and non-const member data.
B)can modify only const member data.
C)can modify only non-const member data.
D)can modify neither const nor non-const member data.

Accepted Answer

A const member function cannot modify any member data of the object for which it was called, whether the data is const or non-const. This ensures that calling the function does not alter the state of the object.

Question 16

Dividing a program into functions
A)is the key to object-oriented programming.
B)makes the program easier to conceptualize.
C)may reduce the size of the program.
D)option b and c

Accepted Answer

Functions help in breaking down a program into smaller, manageable parts, making it easier to conceptualize. Additionally, by reusing functions, the overall size of the program may be reduced.

Question 17

An expression
A)usually evaluates to a numerical value.
B)may be part of a statement.
C)always occurs outside a function.
D)option a and b

Accepted Answer

Expressions can evaluate to numerical values and can be part of statements, but they do not always occur outside a function.

Question 18

A variable of type char can hold the value 301.

Accepted Answer

A variable of type char in most programming languages, including C and C++, is typically 1 byte (8 bits) long, which means it can represent values from 0 to 255 in unsigned form or -128 to 127 in signed form. Therefore, it cannot hold the value 301 directly.

Question 19

It's perfectly all right to use variables of different data types in the same arithmetic expression.

Accepted Answer

In most programming languages, you can use variables of different data types in the same arithmetic expression due to type coercion, where the interpreter or compiler automatically converts types as needed.

Question 20

A function's single most important role is to
A)give a name to a block of code.
B)reduce program size.
C)accept arguments and provide a return value.
D)help organize a program into conceptual units.

Accepted Answer

Functions help organize a program into conceptual units, making the code more modular, readable, and maintainable.

Quiz 1: C++ Class and Function Fundamentals

Every class has at least one constructor function, even when none is declared.

What is the difference between struct and class in terms of Access Modifier?

The default access level assigned to members of a class is

There is nothing like a virtual constructor of a class.

Which of the following operators allow defining the member functions of a class outside the class?

Which type of class has only one unique value for all the objects of that same class?

What is a constructor?

Under what conditions a destructor destroys an object?

When class B is inherited from class A, what is the order in which the constructers of those classes are called

Which one of the following is not a valid reserved keyword in C++?

Variables declared in the body of a particular member function are known as data members and can be used in all member functions of the class.

In a class definition, data or functions designated private are accessible

A member function can always access the data

Classes are useful because they

For the object for which it was called, a const member function

Dividing a program into functions

An expression

A variable of type char can hold the value 301.

It's perfectly all right to use variables of different data types in the same arithmetic expression.

A function's single most important role is to