Constructor in C++

Constructor

• Constructor is a'special' member function.
• Name of constructor and class is always same.
• Constructor invoked when we create class.
• It's called constructor because it construct the value of data member in the class.

Example:
class a
{
  int b,c;
public:
a(void);  //constructor declare
....................
...................
};
a :: a(void)   //constructor defined
{
b=0;
c=10;
}

Characteristics Of Constructor:

• Constructor should be declare in public section.
• Constructor are invoked automatically when object is created.
• Constructor do not have any datatype.
• Constructor cannot be inherited.
• Constructor have default argument like functions.
• Constructor cannot be virtual.

Types Of Constructors:

1. Default Constructor
2. Parameterized Constructor
3. Copy Constructor
4. Dynamic Constructor