I have a comparison for my game.
How would I add +1 for every 5 levels.
For instance:
if(SIZ_CON >= 36 && SIZ_CON <= 40){HIT_POINTS = 50;}
Now for every 5 levels above that add +1. I'm wracking my brain here. Can someone help?

couldn't really tell what you wanted to add for one, but in case hit points try something like this:

HIT_POINTS = 50 + integer(levels_above_that/5);

Ok, sorry guys I wasnt clear, looking back at it now. I had to walk away from my ocde for the day lol...
SIZ (size)
CON (constitution)
SIZ_CON = SIZ + CON;
Total of SIZ_CON determines hit points.
50 hitpoints is alot in this game. SO basically, for every 5 points of SIZ_CON over total of 40 SIZ_CON is only +1 hit point.

Thanks Walori, I'm looking at a counter.

if (SIZ_CON > 40 && !fraction(SIZ_CON / 5)
{
HIT_POINTS ++;
}

Thanks, going to try it.