Answer 1

extraction means just reading as individuals. insertion is just putting values..

I made a sample here.. see this. hope it helps..
https://code.sololearn.com/cv7zCzg5UiMI/?ref=app

Answer 2

A stream is sequence of characters used to transformed between program thread and input/output. It's just a flow of data.

these have clear and simple explanations..
hope it helps.......
https://www.softwaretestinghelp.com/stringstream-class-in-cpp/

https://www.educba.com/c-plus-plus-stream/

https://www.cprogramming.com/tutorial/c++-iostreams.html

Answer 3

You're welcome..