Both function overloading and operator overloading is same 
thing we can reuse the thing. In operator overloading we 
can reuse the operator and user can work through object;
In function overloading we can overloading the same method 
in derived class.

function overloading - function name will be same but
operation will be different for eg:
 
  if we take the function as area 
 then  1. area(int x,int y)
       2. area(int x);
        these r the two functions with the same name but 
  they will differ by their arguments given
 for the 1st function 
it becomes the area of the rectangle=x*y
 for the 2nd function it becomes the  area of square=x*x   
 
  
   coming to the operator overloading,
    it is an overloading function of an operator.
    if we + as an operator 
  a+b then + is operator for the operands a,b
  c+d then + is also an poperator for the c,b.
   these r the two properties of polymorphism.