What are the differences between public, private, and
protected access?




Answers were Sorted based on User's Feedback



Answer / swetcha

We use these keywords to specify access levels for member
variables, or for member functions (methods).

.Public variables, are variables that are visible to all
classes.

.Private variables, are variables that are visible only to
the class to which they belong.

.Protected variables, are variables that are visible only
to the class to which they belong, and any subclasses.


Deciding when to use private, protected, or public
variables is sometimes tricky. You need to think whether or
not an external object (or program), actually needs direct
access to the information. If you do want other objects to
access internal data, but wish to control it, you would
make it either private or protected, but provide functions
which can manipulate the data in a controlled way.

Is This Answer Correct ?    152 Yes 20 No

Answer / manjusinga

public is used for global access that is its scope is not
only within the class but also outside the class.

private is used only in the class class in which it is
defined.It cannot be accessible by its derived members.

protected is used within the class in which it is defined
and derived members of it can also access it.

Is This Answer Correct ?    117 Yes 9 No

Answer / golledla prathap reddy

public data can access anybody in the program.
private data can access olny members of that class.
protected also same like private but the difference is it
can access by derive class also.
we can see the use of protected data in inheritance.

Is This Answer Correct ?    57 Yes 8 No




Answer / krishnachaitanya narne adeesh

Public data is used to access from any where in the program
means any class or any member function can utilize those
variables and member functions.

Where as Private data will not give access to any other
classes and also for derived classes it use those variables
only on particular class only.

Here Protected is similar to Private but difference is just
it gave access to its derived classes also. This is also
opposite to Public.

Is This Answer Correct ?    43 Yes 6 No

Answer / alka choubey

public:class members are access from the outside the class.
private:class members are access only within the class.
protected:class members can access inside the same package.

Is This Answer Correct ?    28 Yes 11 No

Answer / bebo

prvate:is accessed by members of that class only.

public:is accessed by members of any class

protected: variables that are visible only
to the class to which they belong, and any subclasses.

Is This Answer Correct ?    19 Yes 3 No

Answer / prashant kalmodiya

PUBLIC: Specifies that those all members are accessible
from any function.

PRIVATE: Specifies that those members are accessible only
from member functions and friends functions of the class.

PROTECTED: Specifies access to class members in the member-
list up to the next access specifier (public or private)

Is This Answer Correct ?    17 Yes 6 No

Answer / prashanth c patel

public-->inherite the protected members as preotected in
drived class and pubic members wiull be public in derived
class

protected--->pubic and protecated members of the base class
will become protected in derived class

Private-->pubilc and proteacted members will become private
in derived class

Is This Answer Correct ?    21 Yes 11 No

Answer / it

Public is used for global access so its scope is not only
within the class but also outside the class. For example
public variables will be visible to all classes and any
class or member function can utilize those variables and
member functions.

Private is used only in the class in which it is defined.
It cannot be accessible by its derived members. So private
variables will be visible only to the class to which they
belong and it will not give access to any other classes.
Public and protected members will become private in derived
class.

Protected is used within the class in which it is defined
and derived members of it can also access it. So protected
variables will be visible only to the class to which they
belong and it gave access to its derived classes also.

Is This Answer Correct ?    16 Yes 6 No

Answer / abhay

public-->inherite the protected members as preotected in
drived class and pubic members wiull be public in derived
class

protected--->pubic and protecated members of the base class
will become protected in derived class

Private-->pubilc and proteacted members will become private
in derived class

Is This Answer Correct ?    14 Yes 5 No

Post New Answer



More C++ General Interview Questions

Board Coloring Problem Description In this problem you are given a board in which some of the elements are placed as shown in diagram below. Each element represents a color. Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. Find out the minimum number of colors that should be used to fill the blank spaces in the board, so that the above condition is met. Color representation is -: 0, 1, 2, 3, 4, 5, 6, 7……………………. There is sample board: For Example: Given Board : Matrix representation of board is : [ _ 1 _ _ ] [ 2 _ _ _ ] [ _ _ 2 _ ] [ 2 _ _ _ ] here blank space is represented by '_' . Minimum colors to fill this board (given in the picture)is 4. Instruction to work with Open PBT Client: Specify the work directory path in the 'Work directory Path' field. The path should correspond to your solution Work directory. Download the support files by clicking the Get Dev Files. You will find the problem directories containing: problem.h file problem.c file in your project directory. Code the solution in.c file inside the problem directory All required files will be downloaded to your work directory. Creating additional files is strongly discouraged. Step 1: In your Solution File: Implement your logic in function int color(char board[4][4]) char board[4][4]board is 2 dimensional matrix of order M X M where M = 4. You can create more functions if required, but those functions should be in the same file. Step 2: In your solution keep in mind the following constraints. In this problem you have to write a program that finds the minimum number of colors needed to fill a board in which some of the elements are placed in advance. Function color() will take 2 dimension board as a input. Function color() returns the minimum number of colors that could fill the board meeting the given condition. Board is a 2 dimensional of M X M where M = 4 else return 0 Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. The Prototype of the function is int color(char board[4][4]) This function takes following arguments. board is 2 dimensional matrix of order M X M where M = 4. This function returns minimum no of color by which board can be filled. The constraints are: Board is a 2 dimensional of M X M where M = 4 else return 0 Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. Example 1 Input { 2 0 _ 1 } { _ 1 _ _ } { _ 2 _ 0 } { _ _ _ 1 } Output 5 Explanation: We need a minimum 5 different colors to complete the board. Example 2 Input { 2 0 _ 1 3} { _ 1 _ _ 2} { _ 2 _ 0 1} { _ _ _ 1 2} { _ _ _ _ 0} Output 0 Explanation: Size of the board is greater than 4X4. Example 3 Input { _ 0 } { 1 _ } Output 0 Explanation: Size of the board is less than 4X4. For C solutions Header File : boardcoloring.h Function Name : int color(char board1[4][4]) File Name : boardcoloring.c For C++ solutions Header File : boardcoloring.h Class Name : BoardColoring Function Name : int color(char board1[4][4]) File Name : boardcoloring.c

0 Answers   Infosys,


What is RTRT tool?can it be used for automation?can it work on packet PC?

3 Answers  


A mXn matrix is given and rows and column are sorted as shown below.Write a function that search a desired entered no in the matrix .with minimum complexity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

0 Answers  


If P is the population on the first day of the year, B is the birth rate, and D is the death rate, the estimated population at the end of the year is given by the formula: The population growth rate is given by the formula: B – D Write a program that prompts the user to enter the starting population, birth and death rates, and n, the number of years. The program should then calculate and print the estimated population after n years. Your program must have at least the following functions: 1. growthRate: This function takes its parameters the birth and death rates, and it returns the population growth rate. 2. estimatedPopulation: This function takes its parameters the current population, population growth rate, and n, the number of years. It returns the estimated population after n years Your program should not accept a negative birth rate, negative death rate, or a population less than 2.

1 Answers  


Explain working of printf?

8 Answers  


what is importance of data sturture in a programming language?

22 Answers   Wipro, TCS, L&T,


write a program in c++ to generate imp z y x w v w x y z z y x w x y z z y x y z z y z z

4 Answers  


Can you help me with this one? Make a program that when a user inputed a Product Name, it will display its price, and when the user inputed the quantity of the inputed product, it will show its total price. The output must be like this: Product Name: Price: Quantity: Total Price: ..this is the list of products to be inputed: Cellphone - 1500 Washing Machine - 5200 Television - 6000 Refrigirator - 8000 Oven - 2000 Computer - 11000 thanks..:D

1 Answers  


. If employee B is the boss of A and C is the boss of B and D is the boss of C and E is the boss of D. Then write a program using the Database such that if an employee name is Asked to Display it also display his bosses with his name. For eg. If C is displayed it should also display D and E with C?

0 Answers  


program explaining feautures of c++

0 Answers   Satyam,


What are the popular tools used to detect memory leaks in c++

4 Answers   TATA,


in C++ , the word plus plus who found this?

4 Answers  




Categories