C++ programming language part: 52 Inheritance

November 11, 2017 bappi ashraf

Inheritance

The way to reuse existing software to create new software is by means of inheritance also called specialization or derivation. It is an important feature of object-oriented programming. The most important of them being the reusability of code. Once a class is defined and debugged, it can be used to create new subclass. The class from which another class has been derived is called the base class The class that inherits the properties of the base class is called the derived class. The derived class override some or all the properties of the base class. An object defined outside the class can access only the public member of the class. Therefore, private members of a class cannot be directly accessed from outside the class. The protected members of a class can be accessed by its member function, or within any class derived from it. Protected members behave like public members with respect to the derived class, and like private members with respect to the rest of the program.

The common syntax for deriving a class Y from a class X is: class Y:public X

Program 42_1

//inherit.demo

class furniture //class defined

{ protected:

char color[10];

int width,height;

};

class bookshelf:public furniture

{ private:

int self_no; // member data

public:

void data_in()

{

cout<<"Type color of bookshelf (red or blue?)\t";

cin>>color;

cout<<"Type width\t";

cin>>width;

cout<<"Type height\t";

cin>>height;

cout<<"Type number of selves\t";

cin>>self_no; }

void data_out() //member function

{ cout<<" The color is "<

cout<<" The width is "<

cout<<" The height is "<

cout<<" Number of selves is "<

};

class chair:public furniture

{ private:

int leg_no;

public:

void data_in() //member function

{cout<<"Type color of chair (yellow or black?)\t";

cin>>color;

cout<<"Type width\t";

cin>>width;

cout<<"Type height\t";

cin>>height;

cout<<"Type number of legs\t";

cin>>leg_no; }

void data_out() //member function

{cout<<" The color is "<

cout<<" The width is "<

cout<<" The height is "<

cout<<" Number of legs is "<

};

void main()

{bookshelf A; // k is called object

chair B;

A.data_in(); //would be k->data_in() if pointer

A.data_out();

B.data_in(); //would be k->data_in() if pointer

B.data_out(); }

Keyword Size Of

Program 42_extra

{ char a1[10],a2[10];//array of size 10 defined

char *a3; //[20];

int i,j;

a3=new char[20];

cout<<"type the string "<<"\n";

cin>>a1;

cout<<"type another string "<<"\n";

cin>>a2;

for(i=0;a1[i];i++)

a3[i]=a1[i];

for(j=0;a2[j];j++,i++)

a3[i]=a2[j];

a3[i]='\0';

cout<<"The marged string is "<

cout<<" The size of strings= "<

part: 01 Programming Language

part: 02 Compiler

part: 03 Programming Logic

part: 04 Data Type

part: 05 Programming in C++

part: 06 Data Type

part: 07 Get Input from keyboard

part: 08 Operators

part: 09 Arithmetic AssignmentOperators

part: 10 Identifies of Characters

part: 11 do.. while loop

part: 12 unary operators( Incrementand decrement)

part: 13 Decrement

part: 14 for loop

part: 16 Conditional/ternary Operator

part: 17 Break

part: 18 The continue statementforces the next iteration of the loop to take place.

part: 19 Arrays

part: 20 Array Address

part: 21 Arrays and Pointer

part: 22 Two dimensional array

part: 23 Function

part: 24 Function Argument

part: 25 Calling Function

part: 26 Return Values

part: 27 Over Loading Function

part: 29 More about function andothers

part: 30 Passing arrays to function

part: 31 Dynamic memory allocation

part: 32 Library function

part: 33 User define mathematicalfunction (square)

part: 34 I/O Function

part: 35 Boolean Functions

part: 36 Look here's two differentuser define Boolean Functions

part: 37 Function Scope

part: 38 String

part: 39 String I/O

part: 40 Some dafault member function

part: 41 Standard String-Handlingfunction

part: 42 String Array

part: 43 User defined data type

part: 45 Data Storage Type

part: 46 Sratic storage type

part: 47 Extern storage type

part: 48 Classes and Objects

part: 49 Scope Resolution Operator

part: 50 Constructor

part: 51 Destructor

part: 52 Inheritance

part: 53 Overriding Base ClassMembers

part: 54 Scope Resolution with OverriddenMembers

part: 55 Base Class Initialization

part: 56 Multiple Inheritance

part: 57 Protected base ClassInheritance

part- 58 Ambiguity of MultipleClasses

part- 59 Virtual Base Class

part- 60 More about Constructor andDestructor

part- 61 Virtual Function andpolymorphism

part- 62 Virtual function withdynamic polymorphism

part- 63 Streams

part- 64 File Input and Output withabstract data types

part- 65 Writing and Readingcharacter using binary functions

part- 66 The get() function

part- 67 String Input

part- 68 Integer Input and Output

part- 69 File Pointers

part- 70 More abuot Integer Input and Output

part- 71 Exercise:

part- 72 Operator overloading

part- 73 Look here is a program witha class and overload the ==,>,< and += operators

part- 74 Linked List

part- 75 Representing a Node

part- 76 Inserting and Traversing a Node

part- 77 Deleting a Node

part- 78 More about Linked List

part- 79 Programming Logic andTechnique

part- 81 Programming Logic and Technique:

part- 82 Programming Logic andTechnique:

part- 83 Programming Logic andTechnique:

part- 84 Programming Logic andTechnique:

part- 85 Programming Logic and Technique:

Part- 86 assign the content of twostring