Thread: Quick question: exit();

I apologize for asking a super-simple question, but my
book says nothing about it...(Well, at least I don't think
it does. I checked the index, but nothing.)

Quick question. What does the exit() function do? What
would it do in this snippet of code:

Code:

int main()
{
  //Question on exit()

  FILE *filestuff;
  
  filestuff=fopen("file","w");
  if(filestuff==NULL)
  {
     pritnf("Sorry. \n");
     exit(1);
  }
  return 0;
}

I imagine it exits from something. But what? And what
parameters does it accept? What do they mean?

Much obliged.