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   ► KBProgrammingC#Tool Basics   Print This     
  From the November 2009 Issue of Prestwood eMag
 
C# Tool Basics:
C# Comparison Operators (==, !=)
 
Posted 12 years ago on 11/10/2008 and updated 1/18/2009
C# Code Snippet:
 A flashcard from our C# Flashcards Library
 A code snippet from our C# Code Snippets Page

KB101586

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.

C# Comparison Operators

Common comparison operators:

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

Syntax Example:
//Does C# evaluate the math correctly? No!
if (.1 + .1 + .1 == .3)
MessageBox.Show("correct");
else
MessageBox.Show("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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