How C programs can be run without main() function ?

Question

Example C code which works perfectly :
#include <stdio.h>
extern void _exit(register int);
int _start()
{
printf(“Hello World\n”);
_exit(0);
}

Answer 1

Interesting.
According to this:
https://stackoverflow.com/questions/22812682/can-a-c-program-run-without-main-function

The code you showed would still be using a main function.

Although, according to this:
https://stackoverflow.com/questions/3666540/c-program-without-a-main-function

"_start function is the entry point of a C program which makes a call to main()."
So _start is likely another special function.