Illustrate the example of constructor, C/C++ Programming

Assignment Help:

A Constructive Example

Consider an example , to model a user-defined data type for  strings. The object simulates a character array ( string ) using a character pointer and an integer variable for its actual size, which can be explained at its run-time. The object doesn't use a character array , as it may impose a limit on the number of characters that can be stored.

e.g.

# include

# include < string.h>

class string

                 {

                  public :

                                string ( char *s);

                                ~string();

                                void putstr();

                  private :

                                char *cptr;

                                int size;

 };

void main(void)

                 {

                  string s1(" Hello student    \n");

                  string s2 = " Welcome to C++   \n";

                  string s3 = string ( " its fun \n");

 

s1.putstr();

                s2.putstr();

                s3.putstr();

 }

 

string::string(char *s)

                 {

                                size = strlen(s);

                                cptr = new char[size + 1];

                                strcpy(cptr,s);

                 }

string::~string()

                 {

                                delete cptr;

                 }

void string::putstr()

                 {

                                cout << cptr;

                 }

The class explained in the above example contains a character pointer, which allocates memory at run-time, after determining the actual size need. This programme demonstrates the use of class along with the constructor and destructor to make a user defined data type String. The constructor function contains a default argument of null character, which will be assigned to the variable cptr in the absence of an actual parameter. The destructor uses the delete operator to release the memory allocated by the constructor .

 


Related Discussions:- Illustrate the example of constructor

Algorithm, write a pseudo code for computing sin(x) using sentinel control ...

write a pseudo code for computing sin(x) using sentinel control loop

Recursion, write a program to solve e^x

write a program to solve e^x

Matlab to c conversion, i am a engineering student and am working on a proj...

i am a engineering student and am working on a project in audio processing and so i have designed a FIR filter in Matlab . how can i get my Matlab program converted to C program?

C program, program for lexicographically precedes the given input permutati...

program for lexicographically precedes the given input permutation

String function examples, 1. De ne a function chomp :: String -> String tha...

1. De ne a function chomp :: String -> String that selects a run of repeated characters from the start of a string with the run being as long as possible. For example ch

AREA UNDER CURVE, Write a program to find the area under the curve y = f(x)...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Write a c++ program that calculates the area of a circle, Write a C++ progr...

Write a C++ program that calculates the area of a circle, rectangle and square using overloaded versions of a function area ().Your program should include both declarations and def

Explain pros and cons of cpp as a programming language, Write a 3-4 page pa...

Write a 3-4 page paper (350 words per page) in APA format detailing the development and use of C++ in academia and in industry. Explain the pros and cons of C++ as a programming la

Need an indicator, Need an indicator Project Description: Need an ind...

Need an indicator Project Description: Need an indicator which indicates target and trailing sl after entering trades. Skills required are C Programming, C++ Programming,

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