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

KB101876

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.

Perl Comparison Operators

Common comparison operators:

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

Perl also offers additional string comparison operators:

eq string equals
ne string not equal
lt string less than
gt string greater than
le string less than or equal
ge string greater than or equal

Syntax Example:
#Does Perl evaluate the math correctly? No!
if ((.1 + .1 + .1) == .3) {
print("Correct<br>");
} else {
print("Not correct<br>");
}

More Info

Tip:  Round Floating Point Numbers

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