1. Private Sub bntRedDemo_Click(…. Dim intTheOnes As Integer For intTheOnes = 0 To 9 bntRedDemo.Text = intTheOnes.ToString bntRedDemo.Refresh() Sleep(100) Next intTheOnes End Sub 1 2 9

2. Private Sub bntRedDemo_Click(…. Dim intTheOnes As Integer For intTheOnes = 0 To 9 bntRedDemo.Text = “0” & intTheOnes.ToString bntRedDemo.Refresh() Sleep(100) Next intTheOnes End Sub 01 02 09

3. Private Sub bntRedDemo_Click(…. Dim intTheTens As Integer Dim intTheOnes As Integer For intTheTens = 0 To 9 For intTheOnes = 0 To 9 bntRedDemo.Text = intTheTens.ToString & intTheOnes.ToString bntRedDemo.Refresh() Sleep(100) Next intTheOnes Next intTheTens End Sub 01 02 99 10 … … Our first look at a nested loop

4. Dim intLoopCount As Integer For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount Dim intLoopCount As Integer For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount moanday tearsday shatterday … All moanday, tearsday, wailsday, thumpsday, frightday, shatterday till the fear of the Law. James Joyce, Finnegans Wake

5. Dim intLoopCount, intOuterLoop As Integer For intOuterLoop = 1 To 4 For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount Next intOuterLoop Dim intLoopCount, intOuterLoop As Integer For intOuterLoop = 1 To 4 For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount Next intOuterLoop moanday tearsday shatterday … moanday tearsday …

6. Dim intLoopCount, intOuterLoop As Integer Dim strWeekText As String For intOuterLoop = 1 To 4 strWeekText = "Week " & (intOuterLoop).ToString For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = strWeekText & " moanday" Case 2 bntRedDemo.Text = strWeekText & " tearsday" Case 3 bntRedDemo.Text = strWeekText & " wailsday" Case 4 bntRedDemo.Text = strWeekText & " thumpsday" Case 5 bntRedDemo.Text = strWeekText & " frightday" Case 6 bntRedDemo.Text = strWeekText & " shatterday" Case 7 bntRedDemo.Text = strWeekText & " Sunday" End Select Next intLoopCount Next intOuterLoop …

7. Dim intLoopCount As Integer For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount Dim intLoopCount As Integer For intLoopCount = 1 To 7 Select Case intLoopCount Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intLoopCount moanday tearsday shatterday … Recall this example from a few slides ago.. We could make it more readable

8. Const MONDAY = 1 Const SUNDAY = 7 Dim intDayOfWeek As Integer For intDayOfWeek = MONDAY To SUNDAY Select Case intDayOfWeek Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intDayOfWeek Const MONDAY = 1 Const SUNDAY = 7 Dim intDayOfWeek As Integer For intDayOfWeek = MONDAY To SUNDAY Select Case intDayOfWeek Case 1 bntRedDemo.Text = "moanday" Case 2 bntRedDemo.Text = "tearsday" Case 3 bntRedDemo.Text = "wailsday" Case 4 bntRedDemo.Text = "thumpsday" Case 5 bntRedDemo.Text = "frightday" Case 6 bntRedDemo.Text = "shatterday" Case 7 bntRedDemo.Text = "Sunday" End Select Next intDayOfWeek This code is logically identical, but reads better…

9. Do While (Condition) Program Statement(s) Loop Do While (Condition) Program Statement(s) Loop The Do While loop is often used when the repeating process is not controlled by counting with a fixed-step amount, as in a For loop. Instead, use the Do While construct when the loop will continue while a certain condition evaluates to True.

10. Suppose we keep adding the integers 1 + 2 to get 3, then plus 3 to get 6, then plus 4 to get 10 etc. How many times can we do this before we reach 100?

11. Dim intLoopCount, intTotalSum As Integer intTotalSum = 0 intLoopCount = 0 Do While (intTotalSum <= 100) intLoopCount = intLoopCount + 1 intTotalSum = intTotalSum + intLoopCount bntRedDemo.Text = "At " & intLoopCount.ToString & " and the total is " & intTotalSum.ToString Loop … …" At " & intLoopCount.ToString & " and the total is " & intTotalSum.ToString

12. OperationLong Way of Writing the StatementShort Way of Writing the Statement Addition intVar = intVar + 1intVar += 1 Subtraction intVar = intVar – 1intVar -= 1 Division intVar = intVar / 2intVar /= 2 Multiplication intVar = intVar * 2intVar *= 2 String concatenation strVar = strVar & “New Text”strVar &= “New Text” In the previous examples we have seen lots of code like this… intLoopCount = intLoopCount + 1 This is used so much, it has a special name (increment) and a special shortcut syntax…