Do Until Loop in finding the Square Root

Perhaps something like this:

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Wow, thank you very much! :D One last question though, would the do until loop also work for this, or only the for loop works? :D Thanks again!

One last question though, would the do until loop also work for this, or only the for loop works?

Actually, I just printed out your screen shot and worked from there.

But, there is a problem with: Do Until ctr = S ^ (1 / 2)
(1) You made all your variables integers (which means they will always be whole numbers).
As an aside, IMO if you want to work with integers, use long (integers) and not (short) integers.
"As Integer" makes a variable a short integer; "As Long" makes it a long integer.
Because ctr is an integer, ctr will never equal S ^ (1 / 2)

(2) Even if you made ctr "As Double", you might still have a problem. Because of Floating Point Precision.
The way around this would be to Round both numbers to so many digits after the decimal point.
But I would have to play around with the code to be certain.

Ohh, I finally understand! The do until is much better. I'll try to use Round with the do until and see if it works. Thank you so much! :D

If I'm not mistaken, one cannot get more than 15 significant digits out of a double.

Oops, I intended to say "the for loop code is much better". Thanks a lot for the help!