Class and Object and explain diverse specifies.

Q. Define class and object with example and explain diverse specifies.




 Describe the class differentiate the public and private members of the class. Also describe the method to access the private and public members of the class.

Ans. Classes: A class is a group of objects that share general characteristics and relationship. It presents a group of identical objects. The complete set of data and code of an object can be made a user defined data type with the aid of a class. Objects are variables of the category class. In other words objects consists of data, and code to change the data. The complete set of data and code of an object can be made of a user defined data type with the aid of a class. Actually, objects are variables of the category class. Once a class has been stated and clear, we can develop any number of objects related to that class. Each object is related with the data of type class with which they are developed. A class is therefore a group of objects of identical type. For instance, apple, mango and orange are parts of the class fruit. Classes are user defined data types and act like the built in tyres of programming language. The syntax utilized to develop an object is no distinct than the syntax used to develop an integer object in C. If fruit has been defined as a class, then the statement

Fruit mango;

Will create an object mango belonging to the class fruit.

    A simple class example

A typical class declaration would look like:

Class item


Int number;                 // variables declarations

Float cost;                  // private by default


Void get data (Int a, float b);              // functions declarations

Void put data (void);                             // using prototype

                                                              // ends with semicolon


Distinction between public and private: The differences are given in the tabulated form:

Members of base class (visibility)


Of derived




public derivation

private derivation

Protected derivation


Not inherited















Accessing private members:

 . Private data type only:-

include < iostream.h >

Class item


Int number;                                                   // private by default

Float cost;        // private by default


Void get data (Int a, float b);             // prototype declaration,

                                                               // to be defined

// function defined inside class

Void put data (void)


         Cout << "number:" << number << "\n";

}        cout << "cost :" << cost << "\n";


    //..............................member function definition.....................................................

Void item :: get data (Int a, float b)                       // use membership label


 Number = a; // private variables

Cost = b;     // directly used


//.............................main programme...................................

Int main 0


Int main 0


Item x;

Cout << "\n object x" << "\n";

X get data (100299.95);                                            // call member function

X. put data 0; call                                              // member function 

Item y;                                                                     // create another object

Cout << "\n object y" << "\n";

y. get data (200, 175.50);

y. put data 0;

Return 0;


The object of the programme would be:

Object x

Number: 100

Cost : 299.95

Object y

Number: 200

Cost : 175.5

Prime member function: A private member function can only be called as an added function that is a part of its class. Even an object cannot appeal to a private function with the use of the dot operator. Assume a class as defined below:

Class sample


Int m;

Void real (void);                                              // private member function

Public :

  Void up date (void);

Void write (void);

If s 1 is an object of sample, then

S ();           // would not work; objects cannot access

                             // private members

is illegal. Though the function read 0 can be called by the function up date 0 to update an object to update the value of m.

Void sample:: update (void)


Read 0;                                     // simple call; no object is used


   Related Questions in Programming Languages

  • Q : The COBOL ALTER statement Task 3

    Task 3 Explain the effect of the following pictures: 05 FIELD-1 PIC Z(5)9. 05 FIELD-2 PIC £(5)9.99. 05 FIELD-3 PIC £**,***.99. 05 FIELD-4 PIC £££,££9.99DB. 05

  • Q : What is Class header Class header : It

    Class header: It is a header of class definition. The header provides a name to the class and states its access. It too explains whether the class expands a super class or implements any interfaces.

  • Q : What is Big-endian Big-endian : This is

    Big-endian: This is a common difference among machines, the order in which they store individual bytes of multi-byte numerical data. Big-endian machine stores the higher-order bytes previous to the lower-order bytes.

  • Q : Block Started by Symbol What is the

    What is the Block Started by the Symbol?

  • Q : Define Null reference Null reference :

    Null reference: A value utilized to mean, `no object'. Employed whenever an object reference variable is not referring to the object.

  • Q : Explain Call-by-value Call-by-value:

    Call-by-value: The semantics of passing an argument to a method in which a copy of actual argument value is taken and positioned in a separate memory location, symbolized by the corresponding formal argument. As an outcome, assignment to the formal ar

  • Q : Explain Infinite loop Infinite loop :

    Infinite loop: The loop whose termination test never computes to false. At times this is a deliberate act on the portion of the programmer, employing a construct like:         whi

  • Q : Explain the relationship between XHTML

    Explain the relationship between XHTML and XML?

  • Q : Illustrates database connection pooling

    Illustrates database connection pooling which is relative to MTS. Answer: This permits MTS to reuse database connections. Pooling of database connections are put to

  • Q : Write a program to print out ten random

    Write a program to print out ten random numbers from the following sets: a) {0, 1, 2, 3, 4, 5, ...99, 100} b) {1, 2, 3, 4, 5, 6} c) (10, 20, 30, 40, 50,...990, 1000} d) {-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5} e) {1.5, 2.0, 2.5, 3.0, 3.5}  

©TutorsGlobe All rights reserved 2022-2023.