1. Controlling Execution

2. IF and only if.. One line IF IF with and without ENDIF
IF with and without ELSE
One line ELSEIF
Multiple ELSEIFs and Select Case

3. IF and only if.. One line IF (without END IF)
IF (condition) Then Exit Sub
One seeming line IF
IF (condition) Then _
Exit Sub
IF with ENDIF
IF (condition) Then
END IF

4. IF and only if.. One line IF with ELSE Five line IF with ELSE
IF (whatever) Then Yada ELSE YadaYada
Five line IF with ELSE
IF (whatever) Then
Yada
ELSE
YadaYada
END IF

5. IF and only if.. ELSE required alone on one line
IF (whatever) Then
Yada
ELSE
YadaYada
END IF
THEN at end of line required
END IF required alone on one line

6. ElseIF and only if.. ElseIF is subordinate to the previous IF
IF (whatever) Then
Yada
ElseIF (whatever) Then
YadaYada
ELSE
YadaYadaYada
END IF

7. Select Case vs ElseIF Select Case neat and maintainable
Case formats very flexible
Case 1,3,7
Case 2 to 8
Case “CA” to “NM”
Case Is > 21

8. Select Case Example Select Case Security End Select Case "V"
' set properties for volunteers
Case "S"
' set properties for supervisors
Case ""
' exit sub
End Select

9. Immediate If! IIF is a function
IIF(condition, true return, false return)
IIF(blnMale=True,”Male”,”Female”)
Useful in queries, properties, division
IIF(intN > 0, 300/intN, 0) ' to avoid an error msg
IIF(PercentCorrect>=90,"A", _
IIf(PercentCorrect>=80,"B", _
IIf(PercentCorrect>=70,"C", _
IIf(PercentCorrect>=60,"D","F"))))

10. For Loops For intX = 1 to 10 Step 2 For Each varX in varDataSet
Next required for these two For formats
Exit For
Restrictions on For Each…
1-dimension only
Each control variable must be Variant

11. For Loops: Examples Dim varDataSet(0 to 49) as Variant
Dim intX as Integer, intOdd as Integer
Dim intSum as Integer
Dim varItem as Variant, varSum as Variant
' sum the odd numbered elements (1,3,5,…)
For intX = 1 to 49 Step 2
intOdd = intOdd + varData(intX)
Next
' sum all elements (1,2,3,…)
For Each varItem in varDataSet
intSum = intSum + varItem

12. Do Loops Conditional logic after 1 pass through loop Do … Loop While
Do … Loop Until
Or, conditional logic before 1st pass through loop
Do While … Loop
Do Until … Loop
Exit Do

13. Arrays Lists (states, income levels, schedules, etc)
Private, Public, fixed or dynamic size
Dim ccyIncomeLevel(0 to 5) As Currency

14. Which Array to Go? Option Base 1 or Option Base 0?
Public strState(0 to 49) As String
Public strState(1 to 50) As String
Public strState(50) As String
Above will be (0 to 49 or 1 to 50) depending on Option Base

15. strMonth(1) = "January" strMonth(2) = "February" strMonth(3) = "March"
strMonth(4) = "April"
strMonth(5) = "May"
intInput = InputBox("Enter Month Number")
MsgBox “You mean “& strMonth(intInput) & “?”
Or MsgBox “You mean “& strMonth(intInput+1) & “?”

16. Flexible Array Dynamic Expands and contracts
Dim ccyLevel() As Currency
Expands and contracts
Good for uncertain run-time conditions
Can loose contents unless…
Redim Preserve ccyLevel(7)
Can erase dynamic arrays: Erase ccyLevel

17. Strings

18. Notes on strings String variables (Dim strName as String)
String literals (txtName = "Jones")
Mixing variables and literals
Select * from tblRoster Where Name = "Smith"
How to embed quotes around strName?
"Select * from tblRoster Where Name =" & ???

19. How to embed single quotes
' If the name is a hard-coded literal
Debug.Print "Name = 'Smith'"
' If the name is in a variable (very likely)
Dim strName As String
strName = "Smith"
Debug.Print "Name = '" & strName & "'"

20. How to embed double quotes with literal strings
' When the name is a hard-coded literal
Debug.Print "LastName = ""Smith"""
'Coding hints for the triple quotes above:
'step 1: LastName = "Smith"
'step 2: LastName = ""Smith""
'step 3: "LastName = ""Smith"" "

21. How to embed double quotes using variables
Dim strName As String
strName = "Smith"
Debug.Print "LastName = """ & strName & """"
'Coding hints for triple/quadruple quotes:
'step 1: "LastName = strName"
'step 2: "LastName = """ & strName "
'step 3: "LastName = """ & strName & """ "

22. How to embed double quotes as a variable
Dim strName As String
strName = "Nguyen"
Dim strQuote As String
strQuote = Chr(34) ' ACSII for double quote
strName = strQuote & strName & strQuote
Debug.Print "LastName = " & strName

23. String Functions mid(strHayStack, intStart, intLength)
Returns string or part of a string
instr(intStart, strHayStack, strNeedle)
Returns position where needle is in haystack

24. Mid() MyString = "Mid Function Demo" FirstWord = Mid(MyString, 1, 3)
' Create text string.
FirstWord = Mid(MyString, 1, 3)
' Returns "Mid".
LastWord = Mid(MyString, 14, 4)
' Returns "Demo".
MidWords = Mid(MyString, 5)
' Returns "Function Demo".

25. InStr() strHaystack ="XXpXXpXXPXXP“ strNeedle = "p"
intWhere = Instr(1, strHaystack , "W")
Returns 0
intWhere = Instr(4, strHaystack , strNeedle )
Returns 6

26. Other String Functions
Left() and Right() ' args: string, no. of chars
Ucase() and Lcase() ' one arg only
Trim(), Rtrim() and Ltrim() ' one arg only
Val(strA) ' change a string to a number
Cstr(intX) ' change a number to a string
Because Cstr(57) returns " 57" not "57" use Trim(Cstr(intX))