Answer Posted / vindhyachal kumar gupta

C++ virtual function is a member function of a class, whose
functionality can be over-ridden in its derived classes. The
whole function body can be replaced with a new set of
implementation in the derived class. The concept of c++
virtual functions is different from C++ Function overloading.
C++ Virtual Function - Properties:

C++ virtual function is,

* A member function of a class
* Declared with virtual keyword
* Usually has a different functionality in the derived class
* A function call is resolved at run-time

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write a code for this. serial_number contained in the header of the file will be read , if this serial number is less than a previous serial number within a successfully processed file, or is the same as another serial number within a successfully processed file, or if the field contains anything other than 7 digits, then the file must error with the reason ‘Invalid SERIAL_NUMBER’.

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