In C, how is the main() method initially called?

Question

How does a C program get started?

Answer 1

Eventually it is operating system. Usually there is some medium between real entry point and main function, this is inserted by compiler linker.

Some details (related to Windows): There is header in PE file called IMAGE_OPTIONAL_HEADER which has the field AddressOfEntryPoint, which is in turn address of the first code byte in the file that will be executed.