Unit 8: Control Statements
16
Excel Macros Level 1 Control Functions
-
Upload
matthew-campbell -
Category
Education
-
view
552 -
download
1
Transcript of Unit 8: Control Statements
Excel Macros Level 1
Control Functions
M. Campbell - 2010 2
Control Structures
All applications can be written in terms of: Sequence Structures Selection Structures (or Selection Statements) Repetition Structures (or Repetition Statements)
4/29/2010
p. 93
M. Campbell - 2010 3
Flowchart Legend
4/29/2010
M. Campbell - 2010 4
Sequence Structures
Typically built into languageAllows statements to be
executed one after another
Add x and y together.Display the result.
4/29/2010
p. 93
M. Campbell - 2010 5
Selection Structures
Allows code to be executed based on conditions
If the number is even display it
Otherwise, do not display it
4/29/2010
M. Campbell - 2010 6
Repetition Structures
Allows code to be repeated as necessary
While the number is less than or equal to 100, display it.
Once it is over 100, end the program
4/29/2010
M. Campbell - 2010 7
The If…Then Statement
Selection Statement:
If condition Then' statements go here
ElseIf condition2 Then' more statements
Else' more statements
End If4/29/2010
p. 93
M. Campbell - 2010 8
The For Loop
Repetition Statement:
For counter = start To end' statements go here
Next counter
4/29/2010
p. 94
M. Campbell - 2010 9
The For Loop
By default a For loop: Sets counter to the value start Executes the code within the loop body Increments counter Continues looping until counter exceeds the end
value
Can use Exit For to leave For loop early
4/29/2010
p. 95
M. Campbell - 2010 10
The For Loop
Can change the step size:For i = 1 To 10 Step 2
' code block goes hereNext i
Can change the direction:For i = 1 To 10 Step -5
' code block goes hereNext i
4/29/2010
p. 95
M. Campbell - 2010 11
The For Each Loop
Repetition Statement:
For Each objectVar In collection' code block goes here
Next objectVar
4/29/2010
p. 96
M. Campbell - 2010 12
The For Each Loop
Loops through a collection of objectsEach iteration places the next object in the
variable objectVar
4/29/2010
p. 96
M. Campbell - 2010 13
The Do Loop
Repetition Statement:
Do While condition' code block goes here
Loop
Repeats the code block while condition is true
4/29/2010
p. 96
M. Campbell - 2010 14
The Do Loop
Repetition Statement:
Do' code block goes here
Loop While condition
Repeats the code block while condition is trueWill execute at least once (as condition is checked last)
4/29/2010
p. 96
M. Campbell - 2010 15
The Do Loop
Repetition Statement:
Do Until condition' code block goes here
Loop
Repeats the code block until condition becomes true
4/29/2010
p. 96
M. Campbell - 2010 16
The Select Case Statement
Selection Statement:
Select Case testVarCase value1
' code to execute if testVar = value1Case value2
' code to execute if testVar = value2Case Else
' statements to execute otherwiseEnd Select
4/29/2010
