Why main() is mandatory in C++ programs

Every standalone C++ program must contain a function named main.

Exceptions:

• Dynamic libraries (DLLs on Windows): collections of reusable code, do not require a main() function
• Embedded or specialized systems (e.g., microcontrollers): may define alternative entry points.
• Windows GUI applications: These often use WinMain() instead of main() to handle graphical user interfaces.