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   ► KBProgrammingDelphi for W...Language Det...   Print This     
  From the July 2009 Issue of Prestwood eMag
 
Delphi Language Details:
Delphi Comparison Operators (=, <>)
 
Posted 10 years ago on 1/16/2009
Delphi Code Snippet:
 A flashcard from our Delphi Flashcards Library
 A code snippet from our Delphi Code Snippets Page

KB101809



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.

Delphi Comparison Operators

Common comparison operators:

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

Syntax Example:
//Does Delphi evaluate the math correctly? Yes!
//Refer to math.pas MaxSingle for more info.
if (0.1 + 0.1 + 0.1 = 0.3) then
ShowMessage('correct')
else
ShowMessage('not correct')

Delphi 2009 Working Example

Here's a simple working example from a button click event:

procedure TForm1.Button1Click(Sender: TObject);

var

x: Boolean;

begin

x := True;


if x = True then

begin

ShowMessage('X was true');

end

else

begin

ShowMessage('X was false');

end;

end;

More Info

Tip:  Round Floating Point Numbers

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