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Comparison Operators (Delphi Prism and PHP Cross Reference Guide)

By Mike Prestwood

Delphi Prism versus PHP: A side by side comparison between Delphi Prism and PHP.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Comparison Operators

[Other Languages]

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

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 Prism: =, <>

Same as Delphi. Common comparison operators:

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

Syntax Example:

//Does Prism evaluate the math correctly? No!

//This is different than later versions of

//Delphi that muse MaxSingle in math.pas.

If .1 + .1 + .1 = .3 Then
  MessageBox.Show("correct")
Else
  MessageBox.Show("not correct");

PHP: ==, != or <>

Common comparison operators:

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

PHP 4 and above also offers === for indentical (equal plus same type) and !== for not identical (not equal or not same type).

Syntax Example:

//Does PHP evaluate the math correctly? No!

if (.1 + .1 + .1 == .3) {
  echo "correct";
}
else {
  echo "not correct";
}