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Constants (C++ and Access VBA Cross Reference Guide)

By Mike Prestwood

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

Language Basics

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Constants

[Other Languages]

General Info: Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

C++: const

In standard C++, you use const and static const to declare constants.

Syntax Example:

//C++Builder 2009 Example:

const String kName = "Mike";
const int kAge = 35;

ShowMessage("Hi " + kName + ", you are " + kAge + ".");

Access VBA: Const kPI = 3.1459

Scope can be Public, Global, or Private. The use of the newer Public keyword is preferred to the older Global. Private Const is the same as just specifying Const.

Syntax Example:

Const kPI = 3.1459

Const kName = "Mike"

//Public variable:

Public Const kFeetToMeter=3.28, kMeterToFeet=.3

Access VBA Constants (Const kPI = 3.1459)