1.  Name

2.  Data Type

3.  Value- can change

4.  Scope- refers to a public or private function

Private Function

Ex. Private function GO ()

the function can only be used for the current module.

Public Function

Ex. Public Function GO ()

Function can be used on multiple modules.

1. No special characters (!,#,$)

2. Must begin with alpha up to 250 characters

3. Not case SenSitive

Variable Naming Conventions

1. Arent required, but good programming

2. Don't abbrievate unless obvious (ex. StrAddress)

1. Arent required but a good progamming.

2. Makes it easier to understand

Dim, used to declare a variable. 

(ex. Dim IntAge as integer)

For multiple variables use a comma

(ex. Dim IntAge as interger, StrFname as string)

Determines the value of a variable

-Numeric: Zero (0)

-Boolean: (false)

-String: empty string of ""

If not appropriate can assign the values

ex. Variable= intialization value

dbl Frequency=4.2

-Whole #s = (Byte, integer, long) No Decimals

-Decimal # = (single, double, currency)

-Boolean Value = (True/False, Yes/No)

-Strings = (Text)

-Constants = (Never changes)

Dates and Time

Whole # data type and ranges

Byte- 0 to 255

Integer- -32,768 to 32,768

Long- -2,147,483,648 to 2,147,483,648

Single- -3.40E38 to 3.40E38 (7 decimals)

Double- -1.79E308 to 1.79E308 (15 decimals)
Currency- -922,337,203,685,477.5808 to 922,337,203,685,477.5808

-Sequence of characters enclosed in double quotes.

Ex. "BOB"

-Declaration

Ex. Dim StrFname as String

-Assignment

Ex. StrLname = "supercool"

-Top of all modules and forms

-requires all variables to explicity declared

- it will omit a new variable that is created,  but requires formal initalizing.

-improves memory management.

Constants

- Memory location whose contents can't change while a program is running.