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Visual Basic for ApplicationBasic Excel Macro (VBA) Orientation Course

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Course Objectives:

To have a basic knowledge on VBA

To be able to learn the VBA Programming Fundamentals

To be able to make VBA programs

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Getting Started with VBA Part 1:

Before Writing a Program

-Have a thorough understanding of the problem

-Carefully plan an approach for solving it

Algorithm

-Procedure in terms of:

actions to be executed

the orders in which these actions are to be executed

Pseudocode

-Artificial, informal language that helps us develop algorithm

-similar to everyday English

-not actually executed on Computers

-help us think out a program before writing it

Recap

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Getting Started with VBA Part 1:

Variables

-is an identifier (name) for a storage location (memory) which holds a value-elements you interact with

-temporary storage of data

-reference a value in the computer memory

Age Name : Age

Data Type : Integer

Value : 23

Rules

-name can contain letter & numbers; it must start with a letter

-cannot use space & periods

-not case sensitive

-cannot be longer than 256 characters

-cannot use VBA reserved words

-descriptive

Constants

- Variable that cannot be changed

=23

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Getting Started with VBA Part 1:

Declaring Variables

-tell the Computer to reserve space in memory for later use-Dim (Dimension) Statement

-have different Data Types

Option Explicit

Option Implicit

-declare all variables using the Dim,Pivate,Public,Redim,Static Statement-error on undeclared variable names

-avoid incorrect typing of an existing variable name

-avoid confusion in code where the scope of variable is not clear

-not using the Dim Statement

-undeclared variables are of Variant Type

-makes code harder to interpret & more difficult to debug

Dim

Option explicit

Dim MyVar

MyInt = 10

MyVar = 10

myVaras Integer

' Force explicit variable declaration.

' Declare variable.

' Undeclared variable generates error.

Declared variable does not generate error.

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Getting Started with VBA Part 1:

-it is good programming style to declare variables

-it makes the code easier to read for others

-easy to debug

-take up less memory

-code will run faster

Importance:

Data Types

-define the kind of value that may be stored with a memory allocated for a variable

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Getting Started with VBA Part 1:

VBA

Data

Types

Common VBA Data Types

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Getting Started with VBA Part 1:

VBA Mathematical Operators

Assigning values to variables

Assignment #1

Common VBA Mathematical Operators

Operator Precedence

-BODMAS

-declare 2 variables

-use the 5 mathematical operators in the program

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Getting Started with VBA Part 1:

Subroutines

-smallest element in the program that can be executed

-define by the sub keyword

- executed as a macro in Excel

Event Procedures

-triggered by an event

-VBA predefined procedures

Sub ProcedureName ( Parameter list)

[ Statements.}

End Sub

Procedures

-A collection of statements that performs 1 or more given task

-Types: Subroutine & Functions

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Getting Started with VBA Part 1:

Parameter Passing

-copy the value stored in the accompanying variable

-does not affect the original value

ByVal

ByRef

-passing the original variable to the procedure

-does not retain its original value

Example

Assignment #2-declare 2 variables

-use the 5 mathematical operators in the program

-use parameter passing

http://passing.xls/http://passing.xls/

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Getting Started with VBA Part 1:

Function

-return a value to procedure

-Common Excel Functions like Sum, CountA,Count,Vlookup, etc

-User define functions

Function FunctionName ( Parameter list) as Type

[ Function Procedure codes}

FunctionName =FunctionResults

End Function

Example

Assignment #3-declare 2 variables

-use the 5 mathematical operators in the program

-use Function

http://passing.xls/http://passing.xls/

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ting Started with VBA Part 1:

Basic Input/Output with VBA

InputBox

MsgBox

-outputs a message to the user in a form of a message box

MsgBox (prompt [,buttons] [,title] [,helpfile, context])

VBA Help

-F1

-returns the data entered by the user

InputBox (prompt [,title] [,default] [,xpos] [,ypos] [,helpfile, context])

Assignment #4

-ask user to input 2 variables using input box

-use the 5 mathematical operators in the program

-use Function, use Msgbox to prompt result

G tti St t d ith VBA P t 1

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Getting Started with VBA Part 1:

Program Exercise

1. Make a program that will compute for the average of 10 numbers

2. Make a program that will compute for the percentage of a number

3. Make a program that will convert temperature

4. Make a program that will convert mm to cm to in

5. Make any program you want, etc.

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Chapter 2

Chapter 3