1. Built-In Functions

2. NUMERIC FUNCTIONS: SQR, INT, ROUND, VAL, CINT.
Function Sqr(Number As Double) As Double
Sqr(9) is 3.
Sqr(0) is 0.
Sqr(2) is
Function Int(Number)
Int(2.7) is 2.
Int(3) is 3.
Int(-2.7) is -3.
Function Round(Number, [NumDigitsAfterDecimal As Long])
Round(2.7) is 3.
Round(2.317, 2) is 2.32
Round(2.317, 1) is 2.3

3. NUMERIC FUNCTIONS: SQR, INT, ROUND, VAL, CINT.
Function CInt(Expression) As Integer
Dim x As String
Dim y As Integer
x = "2.56"
y = CInt(x)
‘ y = 3
Function Val(String As String) As Double
dim z as double
z = Val(x)
‘ z = 2.56

4. STRING FUNCTIONS: LEFT, MID, RIGHT, UCASE, TRIM
Function Left(String, Length As Long)
Left(“fanatic”, 3) is “fan”.
Left(“12/15/99”, 2) is ”12”.
Function Right(String, Length As Long)
Right(“fanatic”, 3) is “tic”.
Right(“12/15/99”, 2) is ”99”.

5. STRING FUNCTIONS: LEFT, MID, RIGHT, UCASE, TRIM
Function Mid(String, Start As Long, [Length])
Mid(“fanatic”, 5, 1) is “t”.
Mid(“12/15/99”, 4, 2) is ”15”.
Function UCase(String)
UCase(“12three”) is “12THREE”.
Function LCase(String)
LCase(“GREEN”) is “green”.

6. STRING FUNCTIONS: LEFT, MID, RIGHT, UCASE, TRIM
Function Trim(String)
Trim(“ ”) is “1 2”.
Trim(” -12 “) is ”-12”.
Function LTrim(String)
LTrim(“ ”) is “1 2 ”.
LTrim(” -12 “) is ”-12 ”.
Function RTrim(String)
RTrim(“ ”) is “ 1 2”.
RTrim(” -12 “) is ” -12”.

7. STRING-RELATED NUMERIC FUNCTIONS: LEN, INSTR
Function Len(Expression)
Len(“Shenandoah”) is 10.
Len(“Just a moment”) is 13.
Len(“ ”) is 1.
Function InStr( String1, String2)
InStr(“Shenandoah”, “nand”) is 4.
InStr(“Just a moment”, “ ”) is 5.
InStr(“Croissant”, “ist”) is 0.

8. FORMAT FUNCTIONS
Function FormatNumber(Expression, [NumDigitsAfterDecimal As Long = -1])
FormatNumber( , 1) is 12,345.6
Function FormatCurrency(Expression, [NumDigitsAfterDecimal As Long = -1])
FormatCurrency( , 2) is $12,345.63
Function FormatPercent(Expression, [NumDigitsAfterDecimal As Long = -1])
FormatPercent(.185, 2) 18.50%

9. FORMAT FUNCTIONS
Function FormatDateTime(Expression, [NamedFormat As VbDateTimeFormat = vbGeneralDate]) As String
FormatDateTime(“ ”, vbLongDate) is Wednesday, September 15, 1999
FormatDateTime(“ ”, vbLongDate) is Monday, October 23, 2000

10. Random Function Function Rnd([Number]) As Single
randomly displays a number from 0 up to (but not including) 1.
picBox.Print Int(6 * Rnd) + 1;
will display a number between 1 and 6

11. Built-In Functions

12. For Each …….Next Similar to For…..Next Loop
Used with collection of objects or with arrays
Syntax:
For Each element In group
statements
Next element

13. Exiting a loop Exit For For i=0 to 10 Statements statements Next
Exit Do
Do while condition
Loop

14. Exiting a Sub or Function
Private Sub test()
statements
Exit Sub
End Sub

15. Control Arrays Group of Controls that share the same name and type
They also share the same event procedure.
Control arrays are useful if you want several controls to share the same code.
You can create Control Arrays either in design time or at run time.

16. Control Arrays Creating Controls Arrays at Design-Time: three ways
Assign the same name to more than one control.
Copy an existing control and paste it in the form.
Set the controls Index property to a value that is not null.

17. Controls Arrays Creating Controls Arrays at Run-Time:
You must first create the array at design time
Then at run-time you can use the following code.
load controlName(index)

18. Control Arrays Control Arrays share the Same Event procedure . Ex:
Private Sub Command1_Click(index as Integer)
select case index
case 0: statements
case 1: statements
End Select
End Sub

19. Collections A collection is a group of related Objects.
Objects in a collection are referred to as members of the collection.
Each member of the collection is numbered sequentially beginning at 0.
Common collections in visual basic.

20. Collections Common collections in visual basic.
Forms: Contains loaded forms.
Controls: Contains Controls on a form.
Printers: Contains available Printer objects.
Example:
Dim MyControl as Control
For Each MyControl in form1.controls
list1.additem MyControl.name
Next MyControl