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

Program for basically a small store, ¦It should ask customers to enter deta...

¦It should ask customers to enter details such as their names and addresses. ¦It should print a welcome message that includes the customer’s name. ¦It should provide a list of avai

What is some instance of operator overloading?, A: Here are a few of the ma...

A: Here are a few of the many instance of operator overloading: myString + yourString may concatenate two std::string objects myDate++ may increment a Date object a * b may m

C program for maximum no, C Program for MAXIMUM NO, MINIMUM NO AND SORTING ...

C Program for MAXIMUM NO, MINIMUM NO AND SORTING   void main() {           int i,j,t;           int a[5];           clrscr();           for(i=0;i

But mfc appear to encourage the employ of catch-by-pointer;, Q: But MFC app...

Q: But MFC appear to encourage the employ of catch-by-pointer; should I do the similar? A: Depends. If you're utilizing MFC and catching one of their exceptions, by all means, d

Create a mathematical number guessing game, Create a mathematical number gu...

Create a mathematical number guessing game. Have the user prompt for the number of games that they want to play. Then each game consists of the following rules. a. The computer

Is probable to encompass virtual constructor? if yes, Is it probable to enc...

Is it probable to encompass Virtual Constructor? If yes, how? If not, Why?

Recursive procedure to computes the number of digits, (a) Write a recursive...

(a) Write a recursive procedure (digits n) that computes the number of digits in the integer n using a linear recursive process. For example, (digits 42) should return 2 and (digit

Add the two complex no.s given by user - c++ program, THIS PROGRAM IS TO AD...

THIS PROGRAM IS TO ADD THE TWO COMPLEX NO.S GIVEN BY THE USER  */ #include #include #include struct complex     {     int real;     int imag;     }; void main()  {  clrs

Constructor: Copy, b) Why copy constructor accepts reference to an object a...

b) Why copy constructor accepts reference to an object and not the object itself? What happens if we do otherwise?

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