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Possible Duplicate:
In C, how is the main() method initially called?
I want to know, who calls the main function in C.
What is actual use of the main function ( why main is special/necessary ) ?
Can I write a c program with out main function ?
When you ask your operating system to run a file, it loads it into memory, and jumps to it starting point (
_start,etc). At this point, there is an code, that callmainand then exit (The linker is responsible to this part). If you will write program withoutmainfunction, the linker will give you an error, since it couldn’t find it.