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Comparison Operators (C++ and Access VBA Cross Reference Guide)

By Mike Prestwood

C++ versus Access VBA: A side by side comparison between C++ and Access VBA.

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.

C++: ==, !=

Common comparison operators:

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

Syntax Example:

//C++Builder example (ShowMessage is a VCL method).

//Does C++Builder evaluate the math correctly? No!

If (.1 + .1 + .1 == .3)
  ShowMessage("correct");
else
  ShowMessage("not correct");

Access VBA: =, <>

Save as VB Classic. Common comparison operators:

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

Syntax Example:

//Does Access evaluate the math correctly? No!

If 0.1 + 0.1 + 0.1 = 0.3 Then
  MsgBox "correct"
Else
  MsgBox "not correct"
End If