Two main functions

Question

Can we have two main() functions in a C++ program?

Answer 1

Yes! Why not?

Consider the following code:

 namespace ps
 {
     int main(){return 0;}
 }

 int main()
 {
     ps::main();
 }

Its ::main() that will be called during execution.

Answer 2

The standard explicitly says in 3.6.1:

A program shall contain a global function called main, which is the designated start of the program. [...] This function shall not be overloaded.

So there can one only be one one main function in the global scope in a program. Functions in other scopes that are also called main are not affected by this, there can be any number of them.