spacer
Yehuda Shiran November 9, 1999
Fuzzy Comparison
Tips: November 1999

Yehuda Shiran, Ph.D.
Doc JavaScript

Developer News
Microsoft Shows Off Silverlight 4, IE9 Plans
Metasploit Expands Vulnerability Test Framework
HyperCard Reborn?

 The equal operator (==) is not suitable for floating point numbers due to inaccuracy issues. Using logical AND and OR operators, you can check if the number is close to the specified value. For example, if you want to evaluate the expression x == 10.0 you need to use a fuzzy comparison using one of the following expressions: 

((x - 10.0) < 0.001) || ((10.0 - x) < 0.001)

or:

(x > (10.0 - 0.001)) && (x < (10.0 + 0.001))

People who read this tip also read these tips:

Look for similar tips by subject:

internet.commediabistro.comJusttechjobs.comGraphics.com

Search:

WebMediaBrands Corporate Info

Legal Notices, Licensing, Permissions, Privacy Policy.
Advertise | Newsletters | Shopping | E-mail Offers | Freelance Jobs

Solutions

Whitepapers and eBooks

Microsoft Articles: Visual Studio 2010
Adobe Article: Adobe Helps PHP Developers Create Rich Internet Applications
Microsoft Whitepaper: How Windows Server 2008 R2 Helps Optimize IT and Save You Money
Adobe Article: Java Developers Finding a Home at Adobe Flex
IBM Articles: A Smarter Business Needs Smarter Technology
Intel Xeon Processor Increases Server Efficiency and Capabilities
Intel Tech Brief: Automated Energy Efficiency for the Intelligent Enterprise
Oracle Whitepapers - Innovation for IT Leaders
Avaya Article: Communication-Enabled Mashups--Empowering Both Business Owners and IT
 Internet.com eBook: IT Manager's Guide to Social Networking
Internet.com eBook: Get Ready for Windows 7
Microsoft Article: Expression Web 3--New Features for PHP Developers
Whitepapers: Manage Your Business Infrastracture with IBM
Whitepaper: Maximize Your Storage Investment with HP
Internet.com eBook: Becoming a Better Project Manager
Microsoft Article: Stress Free and Efficient Designer/Developer Collaboration
MORE WHITEPAPERS, EBOOKS, AND ARTICLES

Webcasts

Webcast: Connecting PHP to Microsoft Technologies
Video: Microsoft Partner Program Benefits
Video: Windows Azure Debugging Tips
SAP BusinessObjects Webcast: Unlock the Power of Reporting with Crystal Reports
 IBM Webcast: Speed Business Innovation with Reduced Cost and Risk
Video: Deploy Applications on Windows Azure
MORE WEBCASTS, PODCASTS, AND VIDEOS

Downloads and eKits

Download: Microsoft Visual Studio 2010 Beta 2
Downloads & Free Trials: Microsoft's New Efficiency Resource Center
Get the Windows 7 SDK
 Free Trial: Red Gate SQL Backup Pro 6
Iron Speed Designer Application Generator
MORE DOWNLOADS, EKITS, AND FREE TRIALS

Tutorials and Demos

Internet.com Hot List: Get the Inside Scoop on the Hottest IT and Developer Products
All About Botnets
 MORE TUTORIALS, DEMOS AND STEP-BY-STEP GUIDES
webref The latest from WebReference.com Browse >
Rolling Out Your Own HTML Application Version Control · HTML 5: Client-side Storage · Working with Ajax Server Extensions
Sitemap · Experts · Tools · Services · Email a Colleague · Contact FREE Newsletters > 
 The latest from internet.com
Wi-Fi Product Watch, November 2009 · Chip Market Recovering From '08 Collapse · Low-Cost Tools to Kickstart Your New Business