Main function

Every single application must have a main function, which serves as the entrypoint to the program. It is the starting point where a program execute instructions to perform any tasks. Also, there must exist only one main function at a time, no more that two in the same source program.

int main(){

  # code ...

  return 0;
}

int main(string args[]){

  # code ...

  return 0;
}

A main() function must exactly meet the following rules:

• The main() function must be named main, defining an alias for it is not permitted.
• The main() function is a top-level function, so it must not be invoked by itself or by another function.
• There must exist only two versions of the main function, either main() or main(string args[]).
• The return type of the main function must be int and an integer value must be returned from the function.
• Trying to interact with main() function by any actions, such as creating a pointer points to it, etc, will result in a compilation error.