Comments on: fmod() in PHP is the worst !”#¤%&/()= function ever! http://www.divideandconquer.se/2009/11/10/fmod-in-php-is-the-worst-function-ever/ David's Software Development Blog Thu, 15 Sep 2011 10:38:51 +0000 hourly 1 http://wordpress.org/?v=3.0.5 By: David http://www.divideandconquer.se/2009/11/10/fmod-in-php-is-the-worst-function-ever/comment-page-1/#comment-547 David Wed, 11 Nov 2009 14:51:05 +0000 http://www.divideandconquer.se/?p=580#comment-547 @Carl Indeed: $ php -d precision=40 -r 'echo fmod(36,7.2);' 7.199999999999999289457264239899814128876 So, fmod() actually thinks that 36 is 4*7.2 + the above? @Carl

Indeed:

$ php -d precision=40 -r ‘echo fmod(36,7.2);’
7.199999999999999289457264239899814128876

So, fmod() actually thinks that 36 is 4*7.2 + the above?

]]> By: Carl Ådahl http://www.divideandconquer.se/2009/11/10/fmod-in-php-is-the-worst-function-ever/comment-page-1/#comment-545 Carl Ådahl Wed, 11 Nov 2009 14:43:17 +0000 http://www.divideandconquer.se/?p=580#comment-545 Could it be possible that 'echo' is truncating the value? E.g. printing 7.199999999999 as 7.2. Then you have the problem of exact representability of course. Did you try this in C/C#/Java? Could it be possible that ‘echo’ is truncating the value? E.g. printing 7.199999999999 as 7.2.

Then you have the problem of exact representability of course. Did you try this in C/C#/Java?

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