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   ► KBProgrammingC++C++/CLIC++/CLI Lang...   Print This     
  From the June 2009 Issue of Prestwood eMag
 
C++/CLI Language Basics:
C++/CLI Comparison Operators (==, !=)
 
Posted 11 years ago on 1/16/2009
C++ Code Snippet:
 A flashcard from our C++ Flashcards Library
 A code snippet from our C++ Code Snippets Page

KB101813

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++/CLI Comparison Operators

Same as standard C++. Common comparison operators:

== equal
!= not equal
< less than
> greater than
<= less than or equal
>= greater than or equal
Syntax Example:
//Does C++/CLI evaluate the math correctly? No!
if (0.1 + 0.1 + 0.1 == 0.3)
MessageBox::Show("correct");
else
MessageBox::Show("not correct");

More Info

Tip:  Round Floating Point Numbers

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Code Contributed By Mike Prestwood:

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