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![Page 1: CompMathBSc, English 5 October 2006 Programming basics — continued Arrays Cycle Statements: Loops Control Structures vs Conditions Subs: Procedures.](https://reader035.fdocuments.in/reader035/viewer/2022062807/5697bfe91a28abf838cb68f3/html5/thumbnails/1.jpg)
CompMathBSc, EnglishCompMathBSc, English
5 October 20065 October 2006
CompMathBSc, EnglishCompMathBSc, English
5 October 20065 October 2006
Programming basics — continuedProgramming basics — continued
ArraysArrays Cycle Statements: LoopsCycle Statements: Loops Control Structures vs ConditionsControl Structures vs Conditions Subs: Procedures and FunctionsSubs: Procedures and Functions File and data management (I/O)File and data management (I/O) Using the Object BrowserUsing the Object Browser First look on the IDEFirst look on the IDE
Programming basics — continuedProgramming basics — continued
ArraysArrays Cycle Statements: LoopsCycle Statements: Loops Control Structures vs ConditionsControl Structures vs Conditions Subs: Procedures and FunctionsSubs: Procedures and Functions File and data management (I/O)File and data management (I/O) Using the Object BrowserUsing the Object Browser First look on the IDEFirst look on the IDE
[email protected]@ch.bme.hu
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Constants (remark)Constants (remark)Constants (remark)Constants (remark)
Convention: use BLOCK letters to name constants e.g. Dim MYCONST = 100 easily recognised
Convention: use BLOCK letters to name constants e.g. Dim MYCONST = 100 easily recognised
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ArraysArraysArraysArrays
Problem: individual values that should be stored together data of the same type e.g. names of people in a class
Solutions:1. User-defined type (looser)2. Collection (even more looser)3. Array (tight) – a special collection
Problem: individual values that should be stored together data of the same type e.g. names of people in a class
Solutions:1. User-defined type (looser)2. Collection (even more looser)3. Array (tight) – a special collection
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Types of ArraysTypes of ArraysTypes of ArraysTypes of Arrays
Like by variables: Integer, Long -- usual Single, Double String Boolean –- rare Variant -- very rare
= types of values stored in the array must be of the same type
Like by variables: Integer, Long -- usual Single, Double String Boolean –- rare Variant -- very rare
= types of values stored in the array must be of the same type
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Dimensions – 1D, 2D, ...Dimensions – 1D, 2D, ...Dimensions – 1D, 2D, ...Dimensions – 1D, 2D, ...
1D array of 100: [1.00;2.82;3.63;4.11;..;100.75]
2D array of (3;5): [1 2 3 4 5 10 20 30 40 50 8 5 1 3 9]
= 3 rows and 5 columns --> 3x5 matrix 3D array: a cube 4D, 5D, 6D... (rare)
1D array of 100: [1.00;2.82;3.63;4.11;..;100.75]
2D array of (3;5): [1 2 3 4 5 10 20 30 40 50 8 5 1 3 9]
= 3 rows and 5 columns --> 3x5 matrix 3D array: a cube 4D, 5D, 6D... (rare)
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DeclarationDeclarationDeclarationDeclaration
Syntax:Dim MyArray(100) As Single Dim My2DArray(3,5) As Integer
and also:Dim MyArray(1 to 25) As SingleDim My2DArray(3, 8 to 12) As Integer
UBound(), LBound() Option Base 1
Syntax:Dim MyArray(100) As Single Dim My2DArray(3,5) As Integer
and also:Dim MyArray(1 to 25) As SingleDim My2DArray(3, 8 to 12) As Integer
UBound(), LBound() Option Base 1
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ElementsElementsElementsElements
just like individual variables identified by an index
e.g. ReadElement = MyArray(12) ReadElement must be a variable of the right
type MyArray must have an index of 12 ‘Subscript out of range’
just like individual variables identified by an index
e.g. ReadElement = MyArray(12) ReadElement must be a variable of the right
type MyArray must have an index of 12 ‘Subscript out of range’
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Value assignmentValue assignmentValue assignmentValue assignment
I want the element of index 5 to be 8.314:
MyArray(5) = 8.314 with a string array:
MyStringArray(5) = ”8.314” filling up an array: with cycles (loops)
use For .. Next
I want the element of index 5 to be 8.314:
MyArray(5) = 8.314 with a string array:
MyStringArray(5) = ”8.314” filling up an array: with cycles (loops)
use For .. Next
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Dinamic ArraysDinamic ArraysDinamic ArraysDinamic Arrays
Problem: I don’t know the size of the array I need in design-time (depends on user input)
Solution: redimensioningSyntax: first: Dim MyDinArray()
later: ReDim MyDinArray(Rows, Cols) where Rows & Cols are variables (!)
= an elastic bag :)
Problem: I don’t know the size of the array I need in design-time (depends on user input)
Solution: redimensioningSyntax: first: Dim MyDinArray()
later: ReDim MyDinArray(Rows, Cols) where Rows & Cols are variables (!)
= an elastic bag :)
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LoopsLoopsLoopsLoops
Use-case: a block of statements must be repeated many times
Loop types: For .. Next --> I have a fix number (e.g. 25) Do .. Loop --> I have a limiting condition
Use-case: a block of statements must be repeated many times
Loop types: For .. Next --> I have a fix number (e.g. 25) Do .. Loop --> I have a limiting condition
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For .. NextFor .. NextFor .. NextFor .. Next
to run a block of statements a definite number of times e.g. 25
e.g. to fill up an array
For CurrentIndex = 1 To 32MyArray(CurrentIndex) =
CurrentIndex – 1Next CurrentIndex
to run a block of statements a definite number of times e.g. 25
e.g. to fill up an array
For CurrentIndex = 1 To 32MyArray(CurrentIndex) =
CurrentIndex – 1Next CurrentIndex
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For .. NextFor .. NextFor .. NextFor .. Next
Syntax example:For Count = 1 To 25
[statement1][statement2]
...[statementN]
Next Count
Syntax example:For Count = 1 To 25
[statement1][statement2]
...[statementN]
Next Count
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For .. NextFor .. NextFor .. NextFor .. Next
Stepping up (Step 2) or down (Step -2):
For Count = 1 To 30 Step 2 ’run 15 times
[statement1][statement2] ...[statementN]
Next Count
Stepping up (Step 2) or down (Step -2):
For Count = 1 To 30 Step 2 ’run 15 times
[statement1][statement2] ...[statementN]
Next Count
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Do .. LoopDo .. LoopDo .. LoopDo .. Loop
to run a block of statements an indefinite number of times
evaluates a condition to determine whether or not to continue running
types:1. evaluates at the start
While / Until
2. evaluates at the end While / Until
to run a block of statements an indefinite number of times
evaluates a condition to determine whether or not to continue running
types:1. evaluates at the start
While / Until
2. evaluates at the end While / Until
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Do .. Loop (1.)Do .. Loop (1.)Do .. Loop (1.)Do .. Loop (1.)
Syntax: (! logically opposites !)
Do While [Condition=True][block of statements]
Loop
Do Until [Condition=True][block of statements]
Loop
Syntax: (! logically opposites !)
Do While [Condition=True][block of statements]
Loop
Do Until [Condition=True][block of statements]
Loop
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Do .. Loop (2.)Do .. Loop (2.)Do .. Loop (2.)Do .. Loop (2.)
Syntax: (! logically opposites !)
Do [block of statements]
Loop While [Condition=True]
Do[block of statements]
Loop Until [Condition=True]
Syntax: (! logically opposites !)
Do [block of statements]
Loop While [Condition=True]
Do[block of statements]
Loop Until [Condition=True]
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Nested loopsNested loopsNested loopsNested loops
Two or more loops in one another:Do Until Error < 0.001
[statement1]For Count = 1 To 100
[block]Next Count[more statements]
Loop
Two or more loops in one another:Do Until Error < 0.001
[statement1]For Count = 1 To 100
[block]Next Count[more statements]
Loop
Do not nest in more than 3-4 levels depth
Do not nest in more than 3-4 levels depth
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Dealing with conditionsDealing with conditionsDealing with conditionsDealing with conditions
evaluating a condition: True/False or Cases
branching: 2, 3, 4 ... N selection structure:
2 branches (T/F) --> If..Then..Else 3-4 branches --> If..Then..ElseIf..Else more branches --> Select Case
evaluating a condition: True/False or Cases
branching: 2, 3, 4 ... N selection structure:
2 branches (T/F) --> If..Then..Else 3-4 branches --> If..Then..ElseIf..Else more branches --> Select Case
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If..Then..ElseIf..Then..ElseIf..Then..ElseIf..Then..Else
Syntax:If [Condition=True] Then [block of statements]Else ‘this happens if
Condition=False [another block of statements]
End If
Syntax:If [Condition=True] Then [block of statements]Else ‘this happens if
Condition=False [another block of statements]
End If
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If..Then..ElseIf..ElseIf..Then..ElseIf..ElseIf..Then..ElseIf..ElseIf..Then..ElseIf..Else
Syntax:If [Condition1 = True] Then [block of statements]1
ElseIf [Condition2 = True] Then [block of statements]2
ElseIf [Condition3 = True] Then [block of statements]3
Else ‘this happens if all Conditions are False
[block of statements]4
End If
Syntax:If [Condition1 = True] Then [block of statements]1
ElseIf [Condition2 = True] Then [block of statements]2
ElseIf [Condition3 = True] Then [block of statements]3
Else ‘this happens if all Conditions are False
[block of statements]4
End If
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Select CaseSelect CaseSelect CaseSelect Case
Syntax:Select Case [MyVariable] Case [Value1]
[block of statements]1
Case [Value2] [block of statements]2 …
Case [ValueN][block of statements]N
Case Else[else-block of statements]
End Select
Syntax:Select Case [MyVariable] Case [Value1]
[block of statements]1
Case [Value2] [block of statements]2 …
Case [ValueN][block of statements]N
Case Else[else-block of statements]
End Select
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In one rowIn one rowIn one rowIn one row
in simple cases:
If [Condition=True] Then [statement]1 Else [statement]2
in simple cases:
If [Condition=True] Then [statement]1 Else [statement]2
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Nested IfNested IfNested IfNested If
If..Then..(ElseIf..)Else structures can be nested into each other, but consider the extent of this:
If [Condition1 = True] Then [block of statements]1
If [Condition2 = True] Then [block of statements]2
End If [block of statements]3
Else [block of statements]4
End If
If..Then..(ElseIf..)Else structures can be nested into each other, but consider the extent of this:
If [Condition1 = True] Then [block of statements]1
If [Condition2 = True] Then [block of statements]2
End If [block of statements]3
Else [block of statements]4
End If
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Organization of codeOrganization of codeOrganization of codeOrganization of code
Scope (Subs and variables) Private or Public (Global)
Return value no return value --> Procedure (Sub) yes, of a specified type --> Function
Modules and Forms WorkBook Object > WorkSheet Object
Scope (Subs and variables) Private or Public (Global)
Return value no return value --> Procedure (Sub) yes, of a specified type --> Function
Modules and Forms WorkBook Object > WorkSheet Object
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ScopeScopeScopeScope
Private seen within the current Sub
Public (default) seen within the current Module
Global only for variables seen from anywhere hazard! --> rare
Private seen within the current Sub
Public (default) seen within the current Module
Global only for variables seen from anywhere hazard! --> rare
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ProcedureProcedureProcedureProcedure
no return value (usually) General form:
Public Sub SubName([Arg1], [Arg2])
[statements]End Sub
no return value (usually) General form:
Public Sub SubName([Arg1], [Arg2])
[statements]End Sub
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FunctionFunctionFunctionFunction
Syntax:Public Function MyFunction(MyArg As Integer) As Integer
[statements] End Function
Value: reached under the name MyFunction e.g. MyFunction = 5 * MyArg
Syntax:Public Function MyFunction(MyArg As Integer) As Integer
[statements] End Function
Value: reached under the name MyFunction e.g. MyFunction = 5 * MyArg
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Handling eventsHandling eventsHandling eventsHandling events
Event Watching in Windows (auto) Event --> warns all programs running Handled event: procedure call
e.g. Private Sub Workbook_Activate() … End Sub
Event Watching in Windows (auto) Event --> warns all programs running Handled event: procedure call
e.g. Private Sub Workbook_Activate() … End Sub
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File managementFile managementFile managementFile management
open files read from files write to files
we will use only text files (txt)
open files read from files write to files
we will use only text files (txt)
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File managementFile managementFile managementFile management
FileNum = FreeFile ‘Integer, 0-255Open ”MyText.txt” As #FileNum Access
Read[do something with data]
Close #FileNum ‘Never forget!!
FileNum = FreeFile ‘Integer, 0-255Open ”MyText.txt” As #FileNum Access
Read[do something with data]
Close #FileNum ‘Never forget!!
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Data output (in xls)Data output (in xls)Data output (in xls)Data output (in xls)
Cells(Row,Col)=”Message”Cells(Row,Col)=”Message”
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VB for Excel IDEVB for Excel IDEVB for Excel IDEVB for Excel IDE
Project Explorer Properties Window Working area Immediate Window ToolBox (on the WorkSheet) Toolbars: Standard, Debug, Edit,
UserForm Object Browser
Project Explorer Properties Window Working area Immediate Window ToolBox (on the WorkSheet) Toolbars: Standard, Debug, Edit,
UserForm Object Browser
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Object BrowserObject BrowserObject BrowserObject Browser
tree structure functions and parameters
IsNumeric(), Left(), Right(), Mid(), Trim(), CStr(), Cint(), …
return types to use a function in a branch:MyCosValue = VBA.Math.Cos(MyDoubleVar)
... use dots between levels
tree structure functions and parameters
IsNumeric(), Left(), Right(), Mid(), Trim(), CStr(), Cint(), …
return types to use a function in a branch:MyCosValue = VBA.Math.Cos(MyDoubleVar)
... use dots between levels
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InputBox()InputBox()InputBox()InputBox()
Built-in function Syntax:MyNewValue = InputBox(Prompt, Title,
Default)String variable Question Def.
value
Built-in function Syntax:MyNewValue = InputBox(Prompt, Title,
Default)String variable Question Def.
value
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Readable codeReadable codeReadable codeReadable code
End of statement: auto Begin each statement in a new row
e.g. 2 statements in a row: [statement1] : [statement2]
Groups: statments with a similar function e.g. declarations, output statements, value
assignments etc.
Loops: start lines with a Tab inside
End of statement: auto Begin each statement in a new row
e.g. 2 statements in a row: [statement1] : [statement2]
Groups: statments with a similar function e.g. declarations, output statements, value
assignments etc.
Loops: start lines with a Tab inside
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Literature onlineLiterature onlineLiterature onlineLiterature online
You can find the links on our site, just do not forget to do look it up;).
VisualBasic.about.com MSDN VB eBook VBA Tutorial (with example)
+ The 10 Commandments of VB
You can find the links on our site, just do not forget to do look it up;).
VisualBasic.about.com MSDN VB eBook VBA Tutorial (with example)
+ The 10 Commandments of VB
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See you next week:)See you next week:)See you next week:)See you next week:)