Main is usually a function. So then when is it not?

[Kaj G. (Firma: RUB) (bloody)]

Ich finde es immer wieder interessant, auf was fuer Ideen Menschen so 
kommen :)

Main is usually a function. So then when is it not?
http://jroweboy.github.io/c/asm/2015/01/26/when-is-main-not-a-function.html

It began when my coworker, despite already knowing how to program,
was forced to take the intro level Computer Science course at my
university. We joked with him about how he needs to make a program
that works, but the grading TAs wouldn’t be able to figure out how
it works. So that is the requirement, to make a functioning program
that completes an assignment while obfuscating it such that the
graders think that it shouldn’t work.

[...]

[mh (Gast)]

Interessante Idee, aber  ... was sagt der Standard dazu?

The behavior is undefined in the following circumstances:
...
-A program in a hosted environment does not define a function named main using one of the specified forms (5.1.2.2.1).
...

Es ist also nicht nur abhängig von der konkreten CPU, es ist auch klar 
UB.

"I’m guessing all that will happen when my coworker turns in an assignment looking like this is they will take off points for bad coding style and say nothing else about it."

Oder es gibt 0 Punkte, weil das Program nicht funktioniert.

[Jörg W. (dl8dtl) (Moderator)]

Naja, der IOCCC ist ja nun schon lange erfunden. Da könnte sich der
Student ja genügend Anregungen holen, wie man ein Programm so weit
"obfuscated" abfassen kann, dass trotz Konformität zum Standard keiner
mehr weiß, warum es denn funktioniert …