C++

Based on this question asked here: https://www.chegg.com/homework-help/questions-and-answers/must-write-c-requirements-program-demonstrates-inheritance-supply-appropriate-interaction--q108695391?recommendationId=ea9fb0d6-fd77-448d-8263-3c926d7e1926®ionName=recent%20activity§ionId=75f35323-54a2-43ad-9f4e-872d08dc90c6

What codes can I change to allow users to supply their inputs, then output the result?