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► KB ► To/From Guides ► ObjectPAL ► Database

Comparison Operators (Cross Ref > Database)

By Mike Prestwood

ObjectPAL versus PHP: A side by side comparison between ObjectPAL 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.

ObjectPAL: =, <>

Common comparison operators:

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

Syntax Example:

'Does ObjectPAL evaluate the math correctly? No!

If .1 + .1 + .1 = .3 Then
  msgInfo("", "correct")
Else
  msgInfo("", "not correct")
endIf

ObjectPAL Comparison Operators (=, <>)

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";
}