I have serval problems on Utilities module. Please advise how to solve it. Thank you.

Utilities module

This module should contain a single function that creates instances on the Person hierarchy:

Person* buildInstance(std::istream& in);

This function should extract data from the parameter; if the first non-blank character is eor E, then this function should dynamically create instance of type Employee passing the stream to the constructor, and return it to the client.

This function also builds an instance of type Student if the first non-blank character extracted from the stream is s or S, and to build an instance of type Professor if the first non-blank character extracted from the stream is p or P.

If there is no more information to be extracted from the stream, this function should return nullptr.

Because the input file contains two types of delimiters (" " for records, and "," for the fields in a record), you can use the class std::stringstream (utilization of this class is not mandatory, the extraction can be achieved without using it).

When implementing the buildInstance function, consider the following STL class:

• std::stringstream

Problem A: How to return to the client?

Problem B:

C+ Utilities.cpp part 2 x object of abstract class type "sdds::Student" is not allowed: C/C++(322) [Ln 109, Col 25] Utilities.cpp[Ln 109, Col 25]: pure virtual function "sdds::Person::age" has no overrider Utilities.cpp[Ln 109, Col 25]: pure virtual function "sdds::Person::id" has no overrider