Use of null statement in C

Question

What are typical uses of null statement

;

in C ?

I know that it is basically used to skip expression where it is expected

Answer 1

I have used it, albeit rarely, in a possibly unusual situation (and one that some/many people would find wrong). I have had to sometimes write a very complex if condition without an else clause where the if condition has to be negated. Obviously it can be something like this:

if ( !( overly complex condition ) )
  {
  do stuff
  }

It sometimes makes more sense (to me at least) to think of it in terms of positive logic. In other words, if the overly complex condition holds true, I don't want the code to run. So I have instead written it as:

if ( overly complex condition )
  ;  // do nothing
else
  {
  do stuff
  }