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   ► KBWebsite Scri...JavaScript a...Beginners Co...   Print This     
  From the December 2015 Issue of Prestwood eMag
 
JavaScript Beginners Corner:
JavaScript Comparison Operators (==, !=)
 
Posted 11 years ago on 2/11/2009
JavaScript Code Snippet:
 A flashcard from our JavaScript Flashcards Library
 A code snippet from our JavaScript Code Snippets Page

KB101874

General Info: Round Floating Point Numbers

When comparing floating point numbers, make sure you round to an acceptable level of rounding for the type of application you are using.

Languages Focus: Comparison Operators

A comparison operator compares two values either literals as in "Hello" and 3 or variables as in X and Counter. Most languages use the same operators for comparing both numbers and strings. Perl, for example, uses separate sets of comparison operators for numbers and strings.

JavaScript Comparison Operators

Common comparison operators:

== equal
!= not equal
< less than
> greater than
<= less than or equal
>= greater than or equal

Syntax Example:
//Does JavaScript evaluate the math correctly? No!
if (.1 + .1 + .1 == .3) {
document.write("correct");
}
else {
document.write("not correct");
}

More Info

Tip:  Round Floating Point Numbers

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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