[PHP] Re: Division [maybe a bug]
2008/5/11 Chris W [EMAIL PROTECTED]: jo opp wrote: Hello! $var1= 2155243640%31104000; $var2= 2147309244%31104000; echo $var1 // Return -24651656 echo $var2 // Return 1133244 $var2 return the correct result, but $var1 is wrong (the correct result is 9067640) Probably because the maximum signed 32 bit integer value is 2,147,483,648 OK, but with bigger numbers works fine again. Right now I made a function to deal with this issue: function remainder($dividend,$divisor){ $remainder= $dividend-(floor($dividend/$divisor)*$divisor); return $remainder; } What do you think about it? if you are dealing with numbers that large, consider using some arbitrary precision math functions that can work with as large of numbers as you need. http://us3.php.net/manual/en/refs.mathcrypto.math.php -- Chris W KE5GIX Protect your digital freedom and privacy, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm; Ham Radio Repeater Database. http://hrrdb.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Division [maybe a bug]
jo opp wrote: 2008/5/11 Chris W [EMAIL PROTECTED]: jo opp wrote: Hello! $var1= 2155243640%31104000; $var2= 2147309244%31104000; echo $var1 // Return -24651656 echo $var2 // Return 1133244 $var2 return the correct result, but $var1 is wrong (the correct result is 9067640) Probably because the maximum signed 32 bit integer value is 2,147,483,648 OK, but with bigger numbers works fine again. Right now I made a function to deal with this issue: function remainder($dividend,$divisor){ $remainder= $dividend-(floor($dividend/$divisor)*$divisor); return $remainder; } What do you think about it? That will convert the numbers to floating point, which will give you round off error if the numbers get too big. -- Chris W KE5GIX Protect your digital freedom and privacy, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm; Ham Radio Repeater Database. http://hrrdb.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Division [maybe a bug]
jo opp wrote: Hello! $var1= 2155243640%31104000; $var2= 2147309244%31104000; echo $var1 // Return -24651656 echo $var2 // Return 1133244 $var2 return the correct result, but $var1 is wrong (the correct result is 9067640) Probably because the maximum signed 32 bit integer value is 2,147,483,648 if you are dealing with numbers that large, consider using some arbitrary precision math functions that can work with as large of numbers as you need. http://us3.php.net/manual/en/refs.mathcrypto.math.php -- Chris W KE5GIX Protect your digital freedom and privacy, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm; Ham Radio Repeater Database. http://hrrdb.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php