VB & VBA in a Nutshell: The Language

Const Statement

Named Arguments

No

Syntax

[Public|Private] Const constantname = constantvalue

constantname

Use: Required

The name of the constant.

constantvalue

Use: Required

Data Type: Numeric or String

A constant value, and optionally, arithmetic operators. Unlike variables, constants must be initialized.

Description

Declares a constant value: i.e., its value can't be changed throughout the life of the program or routine. One of the ideas of declaring constants is to make code easier to both write and read; it allows you to simply replace a value with a recognizable word.

Rules at a Glance

• The rules for constantname are the same as those of any variable: the name can be up to 255 characters in length and can contain any alphanumeric character, although it must start with an alphabetic character. In addition, the name can include almost any other character except a period or any of the data type definition characters $, &, %, !.

• The constantvalue expression can't include any of the built-in functions or objects, although it can be a combination of absolute values and operators. The expression can also include previously defined constants. For example:

  Private Const CONST_ONE = 1
  Private Const CONST_TWO = 2
  Private Const CONST_THREE = CONST_ONE + CONST_TWO

• The Private keyword restricts the use of the constant to the module in which it's defined, whereas the Public keyword allows the constant to be used in all modules within the project. If neither Public nor Private is declared, ...