C++ Access Control Interview Preparation Guide
Prepare comprehensively for your C++ Access Control interview with our extensive list of 31 questions. These questions will test your expertise and readiness for any C++ Access Control interview scenario. Ideal for candidates of all levels, this collection is a must-have for your study plan. Download the free PDF to have all 31 questions at your fingertips. This resource is designed to boost your confidence and ensure youre interview-ready.31 C++ Access Control Questions and Answers:
1 :: Explain access specifier private?
It is default one and can be access from class member of the same class.
2 :: Explain access specifier protected?
The protected members can be access from member functions of the same class or friend classes or from the members of their immediate derived class.
3 :: Explain access specifier Public?
If a class member is public, it can be used anywhere without the access restrictions.
4 :: What is the importance of mutable keyword?
Mutable keyword allows assigning values to a data member belonging to a class defined as “Const” or constant.
5 :: Explain Class in C++?
User defined data type which contains data and methods to manipulate that data; is known as class. It is the fundamental packaging unit of OO technology. An object is a variable of a Class. Each object is associated with the data of type class with which it is created. Thus we can also say that class is a collection of objects of similar types. It is a user defined data type and behaves like built-in data type of the language. Since class has data and methods to manipulate the data, it supports one of the most important features of OO: Data Encapsulation.
Eg.
class Student
{
int rollno;
int marks1, marks2;
public:
void show(int r); // to print marks
void sum(int r); // to add the marks
};
We can create objects of class using:
class Student s1, s2;
Eg.
class Student
{
int rollno;
int marks1, marks2;
public:
void show(int r); // to print marks
void sum(int r); // to add the marks
};
We can create objects of class using:
class Student s1, s2;
6 :: Explain Structure in C++?
A structure is a collection of variables, referenced under one name, providing a convenient means of keeping related information together. Structure declaration forms a template which can be used to create structure objects. The variables inside a structure are called members. Generally all the members of a structure are logically related. Structure declaration precedes the keyword struct.
Consider following example:
struct address
{
char name[80];
char street[80];
char city[20];
char state[20];
};
Please note the semicolon at the end of structure declaration. This is done because a structure declaration is a statement. The type name of this structure is address. We can create structure variables using:
struct address ad1, ad2;
ad1 and ad2 are two variables of the type struct address..
Consider following example:
struct address
{
char name[80];
char street[80];
char city[20];
char state[20];
};
Please note the semicolon at the end of structure declaration. This is done because a structure declaration is a statement. The type name of this structure is address. We can create structure variables using:
struct address ad1, ad2;
ad1 and ad2 are two variables of the type struct address..
7 :: Can you please explain the difference between struct and class in terms of Access Modifier?
Classes and structures are syntactically similar. In C++, the role of the structure was expanded, making it an nalternative way to specify a class. In C, the structures include data members, in C++ they are expanded to have function members as well. This makes structures in C++ and classes to be virtually same. The only difference between a C++ struct and a class is that, by default all the struct members are public while by default class members are private.
8 :: Explain classes and structure?
Class: User defined data type which contains data and methods to manipulate that data; is known as class. It is the fundamental packaging unit of OO technology. An object is a variable of a Class. Each object is associated with the data of type class with which it is created. Thus we can also say that class is a collection of objects of similar types. It is a user defined data type and behaves like built-in data type of the language. Since class has data and methods to manipulate the data, it supports one of the most important features of OO: Data Encapsulation.
Eg.
class Student
{
int rollno;
int marks1, marks2;
public:
void show(int r); // to print marks
void sum(int r); // to add the marks
};
We can create objects of class using:
class Student s1, s2;
Structure:
A structure is a collection of variables, referenced under one name, providing a convenient means of keeping related information together. Structure declaration forms a template which can be used to create structure objects. The variables inside a structure are called members. Generally all the members of a structure are logically related. Structure declaration precedes the keyword struct.
Consider following example:
struct address
{
char name[80];
char street[80];
char city[20];
char state[20];
};
Please note the semicolon at the end of structure declaration. This is done because a structure declaration is a statement. The type name of this structure is address. We can create structure variables using:
struct address ad1, ad2;
ad1 and ad2 are two variables of the type struct address..
Eg.
class Student
{
int rollno;
int marks1, marks2;
public:
void show(int r); // to print marks
void sum(int r); // to add the marks
};
We can create objects of class using:
class Student s1, s2;
Structure:
A structure is a collection of variables, referenced under one name, providing a convenient means of keeping related information together. Structure declaration forms a template which can be used to create structure objects. The variables inside a structure are called members. Generally all the members of a structure are logically related. Structure declaration precedes the keyword struct.
Consider following example:
struct address
{
char name[80];
char street[80];
char city[20];
char state[20];
};
Please note the semicolon at the end of structure declaration. This is done because a structure declaration is a statement. The type name of this structure is address. We can create structure variables using:
struct address ad1, ad2;
ad1 and ad2 are two variables of the type struct address..
9 :: Do you know what is the default access level?
The access privileges in C++ are private, public and protected. The default access level assigned to members of a class is private. Private members of a class are accessible only within the class and by friends of the class. Protected members are accessible by the class itself and its sub- classes. Public members of a class can be accessed by anyone.
10 :: Explain different access specifiers for the class member in C++?
Access specifiers in C++ determines the scope of the class members.
Public: If a class member is public, it can be used anywhere without the access restrictions.
Private: if a class member is private, it can be used only by the members and friends of class.
Protected: If a class member is protected, it can be used only by the members and friends of class and the members and friends of classes derived from class.
Public: If a class member is public, it can be used anywhere without the access restrictions.
Private: if a class member is private, it can be used only by the members and friends of class.
Protected: If a class member is protected, it can be used only by the members and friends of class and the members and friends of classes derived from class.