Object,Class and Inheritance

-

 Object- 

Object is basically used to bridge a communication between class body and main body. Object are always created inside the main body.

Syntax- 

className  objName =  new className(); 
objName.function();//it could be any function inside the class.

new- new keyword is known as Memory allocation operator. 
dot(.)- Member access operator used to access functions.

    class Program
    {
        public void display(int a1)
        {
            Console.WriteLine("I am a function ");
        }
        static void Main(string[] args)
        {
            int a;
            Program p1 = new Program();
            p1.display();
            Console.ReadKey();
        }
    }
}

Class-  

Class is defined as the collection of data members and member functions. 
 
Data members- all the variable inside the class . 
Member functions- all the functions .  
 
Inheritance :- 

Inheritance is the reusability of class. 
 
Types of classes- 

1. Base Class(top class of the program) 

2. Derived Class  

Rules of Inheritance-  

1. Derived class accesses information to base class. 
2. Base class can not accesses information to derived class.
3. Always last class's object is created.(!imp) 

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