How to call and use function using a pointer?

Question

anyone can tell how this works. they can choose a relevant example and explain it in a simple way.

Answer 1

What language? Is your question essentially the same as this one (or, what's different)?
https://www.sololearn.com/Discuss/1612979/?ref=app

Answer 2

in c language how to call a function not by its name but by a pointer