Avoiding the main (entry point) in a C program

Question

Is it possible to avoid the entry point (main) in a C program. In the below code, is it possible to invoke the func() call without calling via main() in the below program ? If Yes, how to do it and when would it be required and why is such a provision given ?

int func(void)
{
     printf("This is func \n");
     return 0;
}

int main(void)
{
     printf("This is main \n");
     return 0;
}

Answer 1

This really depends how you are invoking the binary, and is going to be reasonably platform and environment specific. The most obvious answer is to simply rename the "main" symbol to something else and call "func" "main", but I suspect that's not what you are trying to do.