1. Loops, Subs, & Functions
Stefano Grazioli

2. Critical Thinking
Homework folders are created for each homework. Submit during the right time window.
EasyMeter 

3. H5

4. It begins with figuring out what needs to be done
Hey, awesome financial calculator! Can I have the table of results in a choice of colors?
User perspective
“Use cases”
Talk about it
Sketch it
Show it
Prototype with paper and pencil

5. Activity Diagram (part III) Simple Financial Calculator
User inputs principal, years, and interest rate
Autofit the columns
User presses “print table” button
Principal, Year, or Rate is missing
Ask the user for a color preference
Alert the user
Print table header and data a b
default
i > number of years
Format the data
Format Table in Red
Format Table in Green
Format Table in Blue
i <= number of years
Print the ith row of data

6. An alternative to IF…THEN when there are multiple options
Ask the user for a color preference
Select Case textFromUser
Case “a” ‘ More instructions… red paint
Case “b”
‘ More instructions… green paint
Case Else
‘ More instructions… blue paint
End Select a b
default
Format Table in Red
Format Table in Green
Format Table in Blue

7. You Do The Talking Name Learning objectives
What you like about the class so far
What can be improved
Attitude towards the Tournament?

8. Loops

9. Loops – For … Next For i As Integer = 1 To 10 Step 1 next
Range(“A3”).Offset(i, 0).Value = i * 100
‘ more commands as needed
next

10. Loops – For Each For Each myCell As Excel.Range in Range("A1:B4")
myCell.Value = myCell.Value * 2
‘ more commands as needed
Next

11. Loops – Do Loop #1 ' count columns. numberOfColumns starts = 0
Do While topLeftCell.Offset(0,numberOfColumns).Text <>""
numberOfColumns = numberOfColumns + 1
Loop

12. Loops – Do Loop #2 Do
‘ body of the loop
Loop While <test>

13. Implementing a nested Loop
Increment r by 2
& reset c
Increment c by 1
For r As Integer = 1 To (numberOfRows-1) Step 2
For c As Integer = 0 To (numberOfColumns - 1)
topLeftCell.Offset(r, c).Interior.Color = Drawing.Color.Pink
Next
Color the cell (offset r,c)
c < (number of columns -1)
r < (number of rows -1)

14. What Is New In Technology?
WINIT
What Is New In Technology?

15. Lasagne and Tagliatelle
Procedures
Lasagne and Tagliatelle

16. Subs are a type of procedure
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim inputFromUser As Double = 0
Dim square As Double = 0
inputFromUser = InputBox("Please enter a number to square")
square = inputFromUser ^ 2
ShowTheUser(square)
End Sub
Private Sub ShowTheUser(someValue As Double)
Range(“A1”).Value = "The result is " someValue.ToString("N0")
A procedure is a named sequence of steps
Purpose: reuse & simplify existing code
Good practice: shorter than a single screen
Sometimes it takes arguments
“Macro” is the old name for procedure

17. Variables and Parameters
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim inputFromUser As Double = 0
Dim square As Double = 0
inputFromUser = InputBox("Please enter a number to square")
square = inputFromUser ^ 2
ShowTheUser(square)
End Sub
Private Sub ShowTheUser(someValue As Double)
Range(“A1”).Value = "The result is " someValue.ToString("N0")
Variables have a lifecycle / scope
Parameters are a special type of variable: used as input to procedures
Find the vars and params in here

18. Functions are another type of procedure
input
Return a single value
Conceptually similar to the formulas in your worksheets
output
Private Function CalcInterest(r As Double, principal As Double, t As Double) As Double
Dim interest As Double = 0
interest = principal * ((((1 + r) ^ t) - 1))
Return interest
End Function

19. Suggestions
None. Doing well.