without using main() program compile or not??

Answer 1

A C++ program always starts at main(), without it the compiler will report an error.
Hope this helpful. 😀

Answer 2

The following applies to Windows:

You cannot build an executable (*.EXE/*.DLL) without some kind of main function, but you can build a static link library (*.LIB) without any main function.

The reason you need a type-of-main function is that the executable needs an entry point. Since you can only link to the functions exported from a static link lib, it does not need such a main function.

But note that under Windows you will need a DllMain function for a DLL (instead of a main function). The signature of DllMain is slightly different to a normal main function:

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)

And for a windows EXE (i.e. one with a GUI) you traditionally use a WinMain function. the signature of this WinMain is slightly different as well:

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

Answer 3

c++ and c programs are compile but not execute..