The C++ class, object, pointer, overloading and string C++ program example

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Embedding a string to the class object type using pointer in C++ programming

To show: How to assign a string to the class object type using pointer in C++ programming

 

// C++ class, object, pointer and string

#include <iostream>

using namespace std;

 

// class declaration

class wall

{

// private by default

int length;

int width;

// a pointer variable

char *line_of_text;

public:

// constructor declaration

wall(char *input_line);

void set(int new_length, int new_width);

int get_area(void);

// destructor

~wall();

};

 

// class implementation

// constructor, provide some initialization

wall::wall(char *input_line)

{

cout<<" Constructor..."<<endl;

length = 8;

width = 8;

line_of_text = input_line;

}

 

// this method will set a wall size to the two input parameters

void wall::set(int new_length, int new_width)

{

length = new_length;

width = new_width;

}

 

// this method will calculate and return the area of the wall instance

int wall::get_area(void)

{

cout<<line_of_text<< "= ";

return (length * width);

}

 

// destructor

wall::~wall()

{

cout<<" Destructor..."<<endl;

}

 

// the main program

void main(void)

{

// objects are instantiated with a string constant as the parameters

wall small("of small size "), medium("of medium size "), large("of large size ");

 

// overriding the default/constructor values

small.set(5, 7);

large.set(15, 20);

 

cout<<" Embedded string used as an object"<<endl;

cout<<" ----------------------------------"<<endl<<endl;

cout<<"Area of wall surface ";

cout<<small.get_area()<<endl;

cout<<"Area of wall surface ";

cout<<medium.get_area()<<endl;

 

// use default value of constructor

cout<<"Area of wall surface ";

cout<<large.get_area()<<endl;

return;

}

 

Output example:

 

Constructor...

Constructor...

Constructor...

Embedded string used as an object

----------------------------------

Area of wall surface of small size = 35

Area of wall surface of medium size = 64

Area of wall surface of large size = 300

Destructor...

Destructor...

Destructor...

Press any key to continue . . .

 

 

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