Transcript Tutorial 9 Slides

Tutorial 9
Introducing Do While & Do
Until Loops & Repetition
Statements
Do While Loop


Do While [condition]
action(s)
Loop
intCounter = 0
Do While (intCounter < 10)
intSumOfNumbersUpto10 += intCounter
intCounter += 1
Loop
Continue 


Repeats the actions as long as the
condition is true
The condition must change, otherwise
infinite loop will occur.

Within the loop add code(s) to change the
condition that eventually become false
Do Until Loop


Do Until [condition]
action(s)
Loop
intCounter = 0
Do Until (intCounter >= 10)
intSumOfNumbersUpto10 += intCounter
intCounter += 1
Loop
Continue 


Repeats the actions as long as the
condition is false
The condition must change, otherwise
infinite loop will occur.

Within the loop add code(s) to change the
condition that eventually become true
Coding with ListBox
Remove items in the ListBox
lstStudents.Items.Clear( )
Class.SubClass.Behavior
or
 Add items to the ListBox
lstStudents.Items.Add (“Name” &
ControlChars.Tab & ControlChars.Tab &
“Course”)

Example
Dim intCounter As Integer = 1
Dim intSumOfNumbersUpto10 As Integer = 0
Do While (intCounter < 10)
intSumOfNumbersUpto10 += intCounter
lstNumbersUpto10.Items.Add(“Number “ &
intCounter & ControlChars.Tab &
intSumOfNumbersUpto10)
intCounter += 1
Loop