int main()
{ int n;
  n=31;
  int *p;
  p=&n;
  *p=18;
  int *q=p;
  *q=25;
  q=new int;
  *q=87;
  q=new int;
  // What's the difference?   p=q vs. *p=*q
  // What if *p=q?
  // What if q=*p?
}