dataabstraction:it is giving only important things hiding 
unnecessary things
 
encapsulation : it is data hiding under  wrapper class
  
  inheritance :it is reusebility code 
  example : parent propert belongs to child
  
  polymorpism: it is flexibility when output depends upon 
no  of input
 in this we have overloading 




overloading means it contains  same data type and 
different  parameters