What is avirtual function?

• A virtual function is member function of the class which has the same name in the base and derived class and provides flexibility to be redefined by derived class
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• prefix ++a
  postfix a++
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• In prefix, the value of operand is increased by 1 then, only it is returned but, In postfix like the value of operand is returned first then, only it is increased by 1.
  
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• in prefix form there is increment in operand value before assignment but it is
  first assign then increased in case of postfix.
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