Controlling Execution

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

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

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

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

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

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

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

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"))))

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

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

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

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

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

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) & “?”

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

Strings

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 =" & ???

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 & "'"

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"" "

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 & """ "

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

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

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".

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

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))