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

Explain syntax rules for writing constructor functions, Syntax rules for wr...

Syntax rules for writing constructor functions Its name must be similar as that of the class to which it belongs. It is declared with no return type (not even void). Ho

Programming an odds betting website, Programming an odds betting website ...

Programming an odds betting website Project Description: We want someone to program a odds betting website, Require someone with experience and skills! Skills required are

Explain type casting, Type Casting Implicit type conversions, as allowe...

Type Casting Implicit type conversions, as allowed by the language, can lead to errors creeping in the program if care is not taken. Thus, explicit type conversions may be used

C program for reverse the string , C Program for REVERSE THE STRING #i...

C Program for REVERSE THE STRING #include stdio.h> #include conio.h> #include string.h> void main() {           char name[30];           char *s;

What are header files and what are their uses, What are header files? What ...

What are header files? What are their uses? - Header files are also known as library files. - They carry two significant things: definitions and prototypes of functions bein

Padovanstring, write a program that counts the number of occurances of the ...

write a program that counts the number of occurances of the string in the n-th padovan string p(n)

Define memory alignment??, Primarily the term alignment refers the tendency...

Primarily the term alignment refers the tendency of an address pointer value to be a multiple of some power of two. Thus a pointer with two byte alignment contains a zero in the le

Define the return statement in computer programming, Define The Return Stat...

Define The Return Statement in Computer Programming? The return statement is used for two purposes once the return statement is executed the program control will be immediately

Wap to print series from 1 to 10 & find its square and cube, # include stdi...

# include stdio.h> # include conio.h> # include math.h>   void main () { int a=1,sqr=0,cube=0; clrscr (); while (a { sqr=pow(a,2); cube=pow(a,3);

Program to compute distance travelled by ball, Produce a pseudo code to be ...

Produce a pseudo code to be used for development compute and display some data on the bounces a ball will make when dropped from a given height. To simplify the problem, you ass

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