While we might guess at some logical answers, out of context, that would be wrong. Those lines are code that were written by SOMEBODY. Ask this question of the person who supplied the code to you.
Without definition, numbers are just numbers, no more than that. And since we lack the context of what the code means, we could easily steer you to the wrong conclusion. It really would be wrong for us to make guesses here.
Finally, if you have these questions, you will have MANY more questions about that same code. TALK TO THE SOURCE.