Difference Between Data Abstraction and Data Encapsulation

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Data Abstraction means something like this :

//Shape provides no implementation of the draw functions
//It abstracts the draw function from other shapes meaning that it
//defines functions that all type of shapes should necessarily have.
class Shape{
  public: virtual void draw()const=0;
};
class Ellipse : Shape{
 public: void draw()const{ API.drawEllipse(); }
};

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