Overloading and Overridding

Type of Overloading
1) Function Overloading
2) Operator Overloading

Difference between overloading & overridding
Overloading is used when we want same name and different parmeters.
Overriding is used when we want to replace the method

In Overloading Name of the function is same but the arguments are different.
In Overriding a local function can override the global function.

overloading is mainly for operators and overriding is for functions

Example(Overloading)
public int add(int a, int b, int c)
{
return a + b + c;
}

public int add(int a, int b)
{
return a + b;
}

Abstract Class

Where can we use abstract modifier?
The abstract modifier is used with following:
1) classes
2) methods
3) properties
4) indexers
5) events

Example of Abstract class

abstract class ShapesClass
{
   abstract public int Area();
}
class Square : ShapesClass
{
   int side = 0;

public Square(int n)
{
   side = n;
}
// Area method is required to avoid
// a compile-time error.
public override int Area()
{
   return side * side;
}

static void Main()
{
   Square sq = new Square(12);
   Console.WriteLine("Area of the square = {0}", sq.Area());
}

interface I
{
   void M();
}
abstract class C : I
{
   public abstract void M();
}

}

Benefits for using Abstract class.
The real benefit of using abstract classes is that the extended classes
can implement the abstract methods in their own way.