What I put with main viod or int

Answer 1

when you use void, it means you don't want anything returned from the function. while an int return may be a result of calculation in the function, or indicate the status when it returning, such as an error number or something else that can tell you what has happened when the function executing.

Answer 2

remember that most compiler don't support void main(),only some old compilers. you should use int main()

Answer 3

int main() is a STANDARD. But for function call used name (in C) or name and arguments types (in C++), not return value types. So many systems will be work if you write void main().