# Using Variables and Constants

#### shivahsingh

##### New Member
This assignment requires you to create 2 macros in one module. Create one global constant and one global variable as follows which are to be used in both macros.
a constant named as “tax” of type double to store tax percentage
a variable named as “totalSales” of type currency
Part 1
You’re to write a macro named as “calculateTotalSales1” to calculate the total sales of four items in your shopping basket. You’ll need to create only one variable named as price of type currency which will be local to this macro. You’re asked to use the variable price four times to get the price for each of the four items in the grocery basket, and make sure you’re adding the price of an item to the totalSales before ask user to enter the price for the next item. Eventually you will be calculating the following:
totalsales= sumofprices+tax/100*sumofprices

I've declared my variables and constant, still confused on how to set the constant as a percentage

and how to use the price variable to create a function,
how do i refer to the cells as prices

the sales numbers are in cells e2:e5

### Excel Facts

Can Excel fill bagel flavors?
You can teach Excel a new custom list. Type the list in cells, File, Options, Advanced, Edit Custom Lists, Import, OK

#### Scott Huish

##### MrExcel MVP
A very helpful source of information is the help file. It even has examples. Why not just ask the teacher?

Const Statement

Declares constants for use in place of literal values.

Syntax

[Public | Private] Const constname [As type] = expression

The Const statement syntax has these parts:

Part Description
Public Optional. Keyword used at module level to declare constants that are available to all procedures in all modules. Not allowed in procedures.
Private Optional. Keyword used at module level to declare constants that are available only within the module where the declaration is made. Not allowed in procedures.
constname Required. Name of the constant; follows standard variable naming conventions.
type Optional. Data type of the constant; may be Byte, Boolean, Integer, Long, Currency, Single, Double, Decimal (not currently supported), Date, String, or Variant. Use a separate As type clause for each constant being declared.
expression Required. Literal, other constant, or any combination that includes all arithmetic or logical operators except Is.

Remarks

Constants are private by default. Within procedures, constants are always private; their visibility can't be changed. In standard modules, the default visibility of module-level constants can be changed using the Public keyword. In class modules, however, constants can only be private and their visibility can't be changed using the Public keyword.

To combine several constant declarations on the same line, separate each constant assignment with a comma. When constant declarations are combined in this way, the Public or Private keyword, if used, applies to all of them.

You can't use variables, user-defined functions, or intrinsic Visual Basic functions (such as Chr) in expressions assigned to constants.

Note
Constants can make your programs self-documenting and easy to modify. Unlike variables, constants can't be inadvertently changed while your program is running.

If you don't explicitly declare the constant type using As type, the constant has the data type that is most appropriate for expression.

Constants declared in a Sub, Function, or Property procedure are local to that procedure. A constant declared outside a procedure is defined throughout the module in which it is declared. You can use constants anywhere you can use an expression.

Example
This example uses the Const statement to declare constants for use in place of literal values. Public constants are declared in the General section of a standard module, rather than a class module. Private constants are declared in the General section of any type of module.

' Constants are Private by default.
Const MyVar = 459

' Declare Public constant.
Public Const MyString = "HELP"

' Declare Private Integer constant.
Private Const MyInt As Integer = 5

' Declare multiple constants on same line.
Const MyStr = "Hello", MyDouble As Double = 3.4567

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