Question:What is Upcasting  and Downcasting. 

Answer Upcasting: An upcast operation creates a base class reference from a subclass reference.
Example:
Stock msft = new Stock();
       Asset a = msft;
Downcasting: A downcast operation creates a subclass reference from a base class reference.
Example:
Stock msft = new Stock();
       Asset a = msft;
       Stock s = (Stock)a;
 

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