CONSTRUCTORS

A constructor is a member function of  a class that has the same name as that of the class. It is automatically called, when an object of the class is created. It's main use is to initialize the members of the class.

Why do we need Constructors?

 giving the default values cannot be done outside the class. Array can be initialized at the time of the declaration but class is different. It's private members are not accessible outside the class. So there is a need of constructors which can initialize the values to the variables if no values are given to them.

Example:

class A
{
private:
             int a;
             int b;
public:
            A()         //This is called Default Constructor
            {
               a=1;
               b=1;
            }
};

void main()
{
clrscr();
A obj;   //Object created 
getch();
}

As soon as the Object is created the private members 'a' and 'b' are initialized. This makes the initialization easy because earlier we have to declare another function for initializing but constructor made that easy.