java - Why does HALF_UP sometimes round down with double? -


the following code:

double doublevalue = 1713.6; float floatvalue = 1713.6f; string fs = "%-9s : %-7s %-7s\n"; system.out.printf( fs, "", "double", "float" );  decimalformat format = new decimalformat("#0"); system.out.printf( fs, "tostring", string.valueof( doublevalue ), string.valueof( floatvalue ) );  format.setroundingmode( roundingmode.down ); system.out.printf( fs, "down", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.half_down ); system.out.printf( fs, "half_down", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.half_up ); system.out.printf( fs, "half_up", format.format( doublevalue ), format.format( floatvalue ) );  format.setroundingmode( roundingmode.up ); system.out.printf( fs, "up", format.format( doublevalue ), format.format( floatvalue ) );

produces result (live code):

          : double  float   tostring  : 1713.6  1713.6  down      : 1713    1713    half_down : 1714    1714    half_up   : 1713    1714   <--- notice line        : 1714    1714

i know numbers cannot represented floating-point numbers. actual floating-point representation 1713.6 1713.5999755859375 (see this page).

but why half_up round down in case?

using java 1.8u25

there bug in java 8 regarding numberformat , roundingmod half_up see 8039915. fixed 8u40 (release notes).


Comments

Post a Comment

Popular posts from this blog

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

php - Bypass Geo Redirect for specific directories -

i'm trying bypass redirect specific url within site. wondering if might able help. the code below code use, original urls replaces example.com i'd able access http://example.com/admin without redirect occuring. is there way this, , there way using own ip? function country_geo_redirect() { $country = getenv('http_geoip_country_code'); if ($country == "us" ) { wp_redirect("http://usa.example.com/"); exit; } else if ($country == "gb" ) { wp_redirect("http://uk.example.com/"); exit; } } add_action('init', 'country_geo_redirect'); you can bypass redirection code if server found ip address. if ip address == <my ip address> ' nothing here else country_georedirect() end if
Read more

php - .htaccess mod_rewrite for dynamic url which has domain names -

i want convert url ex:( example.com/link.php?url=facebook.com ) ( example.com/facebook.com.php ) how can using .htaccess. or there other process make job easier ? i tried adding script .htaccess file options +followsymlinks rewriteengine on rewriterule url-(.*)\.htm$ link.php?url=$1 but converting url adding "url-" ( example.com/url-facebook.com.php ) i want remove "url-" , want make ( example.com/facebook.com.php ) rewriteengine on rewritecond %{the_request} ^get.*link\.php\?url\= [nc] rewritecond %{request_uri} !/system/.* [nc] rewriterule (.*?)link\.php\?url\=/*(.*) /$1$2 [r=301,ne,l] not sure how above work edit of used use remove index.php url
Read more