Argue the advantages, disadvantages, and provide usage examples of the following:



For Next Loops

Do While Loops

Do Until Loops

for loops : used when you wish to run something a number of times

  for homeWorkQuestions = 1 to 10
    answer(homeWorkQuestions) = "copied from google"
  next

do while : used to loop until a condition is fulfilled. Runs at least once.
 
  do
    askForHomeWorkHelp()
  while (unansweredQuestions > 0)

do until : used to loop until a condition is fulfilled, with the
condition evaluated first, may not run at all

  do until (unansweredQuestions = 0)
    askForHomeWorkHelp()
  loop

As they all perform different ways of controlling flow the advantages
and disadvantages are specific to the situation in which they are
used.

For example you would use do until if you are opening a file and wish
to process every linein the file. You cannot use a for loop as you
don?t know how many lines there are. If you use a do while the
operation inside the loop will execute once, and you cannot be sure
the file is not, in fact, empty.