How main function is different then other functions in C?

Question

This was asked today in my interview and I was not having any clue. Any pointer would be helpful.

Answer 1

main() is the entry point as far as C is concerned. The loader sets the main()'s address as the contents of the program counter once the loading is complete and the state of the program changes from "loading" to "running"

• You cannot have 2 or more main()s in an application. Only main() is permitted in the application
• main() should be in the global namespace
  -main() cannot be a member function
• main() has a few predefined prototypes

You may want to check https://en.wikipedia.org/wiki/Entry_point#C_and_C.2B.2B