What will this C code do?

void main(){
int x=1;
printf("%d\n",x=2);
}

>>95
I don't know.  I'm just getting this feeling that there's just too many little things like this, just waiting there to bite me in the allegorical ass.  I'm afraid for the security and correctness of my code.  Sigh.  I don't know, I might actually start working in assembly for my low-level work.  But then I'd have to completely rewrite everything for other architectures.  That's a lot of extra work.  I'm gonna go pop a beer and maybe I'll figure it out eventually.