B4R Question Do While vs Do Until

[canalrun]

I'm converting a C program to B4R.

In the C program I have:

do {
  l >>= 1
} while (mr+l > nn)

above "l >>= 1" is guaranteed to execute at least once.

in B4R if I do:

Do Until ((mr + l) <= nn)
  l = Bit.ShiftRight(l, 1)
Loop

Is this the same?
Is the condition tested at the top or end of the loop?
Is "l = Bit.ShiftRight(l, 1)" guaraneed to execute at least once.

Or maybe in B4R if I do:

Do While (True)
  l = Bit.ShiftRight(l, 1)
  if ((mr + l) <= nn) then exit
Loop

The documentation and "Beginners Manual" don't explicitly answer this.

Thanks,
Barry.

 

[OliverA]

You’ll have to go the do while true route or

l = Bit.ShiftRight(l, 1)
Do Until ((mr + l) <= nn)
  l = Bit.ShiftRight(l, 1)
Loop

or a little closer to the original (when it comes to the condition)

l = Bit.ShiftRight(l, 1)
Do While (mr+l > nn)
  l = Bit.ShiftRight(l, 1)
Loop