This document provides an overview of coding concepts, IF statements, IIF statements, and Select Case statements in VBA for beginners. It explains how to read code, use operators and characters like concatenation and line continuation, and step through code. It provides examples and syntax for IF statements, IIF statements, and Select Case statements.

1. Access VBA Programming
for Beginners
- Class 4 -
by
Patrick Lasu
p_lasu@lycos.com

2. Class 4 - Overview
 Coding Concepts
– Reading Code
– VB Operators/Characters:
» Concatenation, Line Continuation, Comments
– Stepping through Code
 IF Statements
 IIF Statements
 Select Case Statements

3. Coding Concepts
 Reading Code
– Reading code can be tricky
» Statements to the left and right of an equal
sign will not be equal until the code is
executed (and then it can be “not equal”
again).
– Tip 1: Read (evaluate) from the right of
the equal sign to figure it out
– Tip 2: Do not worry about “past”
statements

4. Coding Concepts
Reading Code – Example 1
VBA Code Behind the scenes
intValue = 5 + 2 0=5+2
Next Line of Code Next Line of Code

5. Coding Concepts
Reading Code – Example 1
VBA Code Behind the scenes
intValue = 5 + 2 7=5+2
Next Line of Code Next Line of Code

6. Coding Concepts
Reading Code – Example 2
VBA Code Behind the scenes
intValue = 5 0=5
intValue = intValue + 2 0=0+2
Next Line of Code Next Line of Code

7. Coding Concepts
Reading Code – Example 2
VBA Code Behind the scenes
intValue = 5 5=5
intValue = intValue + 2 5=5+2
Next Line of Code Next Line of Code

8. Coding Concepts
Reading Code – Example 2
VBA Code Behind the scenes
intValue = 5 7=5
intValue = intValue + 2 7=7+2
Next Line of Code Next Line of Code

9. Coding Concepts
 Concatenation character:
& (ampersand)
 Used for putting expressions together
Example:
strFirstName = “John”
strLastName = “Doe”
strFullName = strFirstName & “ “ & strLastName
 Avoid using „+‟ to concatenate, it can
produce unexpected results

10. Coding Concepts
 Line continuation character:
_ (underscore)
Example:
Msgbox “This is important“, _
vbOKOnly, “My Message”
String Example:
strMsg= “This is a very important “ & _
“message from me!”
 Limit is 25 lines, or 24 line continuations

11. Coding Concepts
 Making comments
– Use „ (apostrophe) to start a comment
– Comments are not executed; used to document
what the code is suppose to do
» No need to write an essay
Example:
„Assign a value
intValue=5
Rem Example:
Rem Assign a value
intValue=5

12. Coding Concepts
 Stepping through code
– Use [F5] in the code window to execute the
code
– Use [F8] in the code window to execute the
code one step at a time
 Works in a Standard Module, does not work
in a Form Module.

13. IF Statement
 An IF statement evaluates a condition to find
out if it is True or False, then executes the
appropriate statement(s)
 Type the word „If‟ in the code window and
press [F1] for help on the topic

14. IF Statement
 Syntax (Single Line):
If condition Then [statements] [Else elsestatements]
If Sales>100K Then Bonus=10% Else Bonus=1%
 Syntax (Multi-Line) Pseudo-code:
If condition Then If Sales>100K Then
[statements] Bonus=10%
[Else Else
[elsestatements]] Bonus=1%
End If End If

15. IF Statement
 Syntax (If…Then…ElseIf…Then…Else)
If condition Then If Sales>100K Then
[statements] Bonus=10%
[ElseIf condition-n Then ElseIf Sales>50K Then
[elseifstatements] ... Bonus=5%
[Else Else
[elsestatements]] Bonus=1%
End If End If

16. IF Statement
 Nested IF Pseudo-Code:
If condition Then If Sales>100K Then
If condition Then If NewClients>5 Then
[statements] Bonus=15%
[Else Else
[elsestatements]] Bonus=10%
End If End If
[Else Else
[elsestatements]] Bonus=1%
End If End If

17. IF Statement
 Operators for IF Statement condition
– Equal (=)
– Not Equal (<>)
– Less Than (<)
– Less Than Or Equal To (<=)
– Greater Than (>)
– Greater Than Or Equal To (>=)

18. IF Statement
 Logical Operators
– And If Sales>100K And NewClients > 5 Then
– Or If Sales>100K Or NewClients > 10 Then
– Not If Not(Sales>100K) Then
– Xor
– Eqv
– Imp

19. Immediate IF
 Immediate If is similar to If statements
– Syntax
IIf(expr, truepart, falsepart)
IIf(Sales>100K, Bonus=10%, 1%)
– Can be nested
IIf(expr, truepart, IIf(expr, truepart, falsepart))
IIf(Sales>100K, Bonus=10%, IIf(Sales>50K, Bonus=5%, Bonus=1%))
 Type the word „IIf‟ in the code window and press [F1] for
help on the topic

20. Immediate IF
 The drawback is that it always evaluates
both true and false part
– It is slower than IF statements
– Can give unexpected results

21. Select Case
 Select Case is similar to If…Then…ElseIf
statements.
 The difference is that it evaluates an
expression once and then compares it to
different values
– Makes it more efficient than multiple ElseIf
statements
 Type the word „Select‟ in the code window
and press [F1] for help on the topic

22. Select Case
 Syntax: Pseudo-Code:
Select Case testexpression Select Case Sales
[Case expressionlist1] Case >100K
[statements] Bonus=10%
[Case expressionlist2] Case >50K
[statements] Bonus=5%
[Case Else] Case Else
[statements] Bonus=1%
End Select End Select