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C++ Constructor

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C++ Constructor and Destructor

Constructor is a special member function whose name is same as the name of class name. Constructor is used to initialize the objects of class. Each time the constructor method is invoked when an object is created. It constructs the values of data member of the class so it is called as constructor.

Constructor declaration and definition

class  className{  
           //data member;  
           public:  
           className(returnType); //constructor declaration   
           ......  
};  
className :: className(returnType){ //constructor definition  
           //data member= initialize;  
}

				
					
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						class  className{  
           //data member;  
           public:  
           className(returnType); //constructor declaration   
           ......  
};  
className :: className(returnType){ //constructor definition  
           //data member= initialize;  
}

					

			

When an object of class is created it automatically initializes the data member inside constructor definition. For example the statement:

className objectName;

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						className objectName;

create object of class as well as initialize the data member.

C++ Types of Constructor

Constructor is categories into different types. These are:

Default constructor
Parameterize constructor
Copy constructor
Dynamic constructor

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