In our previous episode, Dmitry Lizorkin said: > I was surprised to find out that the expression (-1 mod 3) yields -1 in Free > Pascal. On the other hand, Pascal ISO 7185:1990, section 6.7.2.2) explicitly > defines the `mod' operation "such that 0 <= i mod j < j". > What do i miss here? FPC is Delphi compatible and Delphi returns -1.