I guess I don't mean perfect squares, more or less square roots with terminating decimals. Thanks for all the help, and I found that Jason's code will work for the program I'm doing right now.
Thanks, Stephen Craton http://www.melchior.us - -----Original Message----- - From: Jason Barnett [mailto:[EMAIL PROTECTED] - Sent: Tuesday, May 25, 2004 6:59 PM - To: [EMAIL PROTECTED] - Subject: [PHP] Re: Perfect Squares - - Stephen Craton wrote: - - > I'm in a bit of a pickle. I need to find out if a variable is a perfect - > square or not, and this needs to test for decimal numbers as well, such - as - > 2.25. The thing is, the only function I've found in PHP is - > gmp_perfect_square() which isn't supported on my web server, and I don't - > know how to compile the GMP code into PHP on my windows box. So, how - exactly - > would you go about finding out if something is a perfect square or not? - - It's been a while since I studied this in math, so I figured I'd find - out the definition of perfect square. What I found: - http://en.wikipedia.org/wiki/Perfect_square - - Neither of those definitions fit what for your example number 2.25. For - instance, - - $sqrt = sqrt($number); - if ($sqrt * $sqrt == $number) { - //should always be true, except negative values and possibly rounding - } - - -- - 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
