Visual Basic.NET How to Program (PDF)

174 Control Structures: Part 2 Chapter 5
Repetition is implemented in one of seven ways:
While structure
Do While/Loop structure
Do/Loop While structure
Do Until/Loop structure
Do/Loop Until structure
For/Next structure
For Each/Next structure (introduced in Chapter 7)
It can be proven straightforwardly that the While structure is sufficient to provide any
form of repetition. Everything that can be done with the Do While/Loop, Do/Loop
While, Do Until/Loop, Do/Loop Until, For/Next and For Each/Next structures
can be done with the While structure (although perhaps not as elegantly).
Rule 3
Rule 3 Rule 3
Fig. Fig. 5.28 5.28 Applying rule 3 of Fig. 5.25 to the simplest flowchart.