Does every cpp need to include main()?

Question

C++ / C#

Studying from the textbook, I saw this thing: "Every C++ program must include a main() function." Every cpp file must include a function main();?

Answer 1

Only the main one.
In additional (where you just store the code so that the main file does not clutter up), of course, it is not necessary.
A program can consist of many cpp files, or maybe one, but main() is specified only once in all cases.

Answer 2

main in c++

necessary because it is the entry point to the application. It should only be used in the main cpp file.