Tutconstructordes

Constructor/Destructor Functions Presentation By : Ms. Niti Arora

OBJECTIVES:After this presentation we shall be able to answer following questions: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is a CONSTRUCTOR Function? ,[object Object],[object Object],[object Object]

A Constructor is declared and defined as follows: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Characteristics of Constructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

C++ The default constructor takes no arguments . If no such constructor is defined, then compiler supplies a default constructor. For Example X X1; The default constructor for class X is X::X( ) The statement X X1 ; invokes the default constructor of the compiler to create the class object; Default Constructor

C++ Parameterized Constructor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Create a temporary Object And execute copy constructor Create object and copy contents of temporary object

C++ : Constructor with Default Arguments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Parameterized constructor can also have default paramter. Calling with one value Calling with both values

C++ : Constructor Overloading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Two or more constructors with the same name but different in their signature or arguments.

Example of Constructor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Default constructor to initialize F with 1 Parameterized function to calculate factorial Fact :: Fact(int n) { for(int i=1;i<=n;i++) { F*=I; } } void Fact :: Cal(int n) { for(int i=1;i<=n;i++) { F*=I; } }

C++ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],void main () { int n; Fact F1 cout<<“Enter Number”; cin >> n; F1.Cal(n); F1.display(); } Parameterized constructor is executed Default constructor is executed

C++ : DESTRUCTOR FUNCTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

public: ~X (); // DESTRUCTOR FUNCTION X::~X ( ) { cout<<“Over……………….”; } C++ DESTRUCTOR FUNCTION

Why A destructor Function? ,[object Object],[object Object],[object Object]

Example of destructor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Constructor executed when object is created. Destructor executed when object goes out of scope

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],As soon as main gets over destructor will be executed

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