The reason that $ns1 is getting set to 1 so many times is because you are doing this:
picking a random number between 900000 and 1200000. using number_format to convert that number into a string such as 900,000 or 1,200,000. Then using that *string* in a mathmatical operation. So, for as soon as $ns1 is greater than 1,000,000 it is *always* going to evaluate to 1 in your third line. At least I think so... on my machine if I do this: $x = number_format("1,234 + 5"); $x gets set to "1". Take out all but the last number_format() function and see what happens. -philip On Thu, 28 Feb 2002, Roy Cabaniss wrote: > I have a very simple php page which I am creating an accounting tutorial > from. I am writing all of the equations on an include file and then calling > the file at the beginning of the appropriate pages > > My problems lie in inconsistant arithmatic operations. For some reason the > equation for $gm1 does not always act as though $ns1 has a value. Only about > 30% of the time does $gm1 give the number I expect to see. The rest of the > time what I get is a negative (-$cogs1 +1). As if you had taken 1 and > subtracted $cogs1. All help MUCH appreciated. > > > srand ((double) microtime() * 1000000); > #### Income statement > $ns1=number_format(rand(900,1200)*1000) ; > $cogs1=number_format(rand(450,600)*1000) ; > $gm1=number_format (($ns1 - $cogs1) * 1000); > > > > > > Dr. Roy F. Cabaniss > Associate Professor of Business > University of Arkansas Monticello > http://cabanisspc.uamont.edu/~rcaban > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php