Well just for clarification, Modulus is a type of division that gives you the remainder, not the answer.  It is useful because if I have an increasing value 1 2 3 4 5 6 7 8 9... and I take a Modulus # of it, the result will be a looping value up to that number.

For instance, A % 4, (% is the Modulus operation) where A is increasing by 1 each iteration would yield:
0 1 2 3 0 1 2 3 0 1 2 3

So if I took the Modulus of the X coordinate, I could use it to yield a positively increasing loop while moving to the right (0,1,2,3,0,1,2,3...) and a negatively increasing loop while moving to the left (3,2,1,0,3,2,1,0...) and when standing still the sprite would not change at all.  The benefit to this method is that you don't have to do any monitoring of the keys, as everything is entirely dependent on only the x coordinate. (Monitoring the keys can be difficult when using xLibs real(8 ) because of the multiple key commands )

I think "modulo" is actually the correct term.

Two numbers are said to be congruent modulo n when their remainder upon division by n is the same (e.g. 7 is congruent to 3 modulo 4).  The modulus is n.  When you perform "a % n" and get "c", this is saying "a is congruent to c, with a modulus of n".  The word "modulo" translated from Latin literally means "with modulus".

Btw you might want to be careful when replying to topics, to check the last post date before posting (The board will give you a warning if the topic has been over 180 days old anyway), since necroposting (reviving threads that are several months old) is generally not appreciated on web forums.

I think this project is kinda dead, unfortunately