Explain pointers to objects, C/C++ Programming

Assignment Help:

Pointers to Objects

Passing and returning of objects is, though, not very efficient since it includes passing and returning a copy of the data members. This problem can be eliminated using pointers. Like other variables, objects of class can also have pointers. Declaring a pointer to an object of a certain class is same as declaring a pointer to a variable of any other data type. A pointer variable having the address of an object is said to be pointing to that object. Pointers to objects can be used to make a call by address or for dynamic memory allocation. Just like structure pointer, a pointer to an object also uses the arrow operator to access its members. Like pointers to other data types, a pointer to an object also has only one word of memory. It has to be made to point to an already existing object or allocated memory using the keyword 'new'.

e.g.

                string str;             // Object

                string *sp;           // Pointer to an object

                sp = &str;             // Assigns address of an existing object

                sp = new string // Allocates memory with new.

A simple example of using pointers to objects is given below.

                class player

                 {

                  public :

                                                void getstats(void);

                                                void showstats(void);

                  private :                                                            

                                                char  name[40];

                                                int   age;

                                                int   runs;

                                                int   tests;

                                                float average;

                                     float calcaverage(void);

                };

 void main()

                  {

                    player Sachin;

                                Sachin.getstats();

                                Sachin.showstats();

                  player  *Dravid;

                                Dravid = new player;

 

                                Dravid->getstats();

                                Dravid->showstats();

                  }

 


Related Discussions:- Explain pointers to objects

Which one would you prefer - a macro or a function, Which one would you pre...

Which one would you prefer - a macro or a function? Actually it depends on the purpose of program! - In case of macros, corresponding code is inserted directly into your sou

#accept 3 digit number, Write a ''C'' program to accept any 3 digit integer...

Write a ''C'' program to accept any 3 digit integer number from the keyboard and display the word equivalent representation of the given number

Create a class string which stores a string value, Question 1 Write a prog...

Question 1 Write a program that accepts two numbers from the user and swaps the two numbers without using a temporary variable Question 2 Write a program that accepts a 3x

Cross platform clinet app for a vpn, Cross Platform Clinet app for a vpn ...

Cross Platform Clinet app for a vpn Project Description: We want a cross platform client app for VPN. The app must have the subsequent options below: 1. Must be an open

Control structures in cpp, Control structures The control structures app...

Control structures The control structures appear in both structured programming languages as well as object oriented programming languages.  The three constructs used are: i)

VS Project, Hi, I want to get rtsp source for windows

Hi, I want to get rtsp source for windows

what does it mean to declare a member variable as a static, b) The static ...

b) The static keyword let a variable to maintain its value among distinct function calls. If the value of a static variable alters while the variable has been accessed, variable

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd