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Square root without sqr

The code is simply shows you how to evaluate square root without using sqr function. It may not really be usefull but if you interested it'll be of some value to you.By the way, i was surprised when after search for simmilar function only found examples of using Sqr(x)

Inputs
integer

Assumes
In order to have this code working you need to create two text boxes "text1" and "text2" names are default and a command button named "command1" enter value you want to square root in text1 and you'll get result in text 2

Returns
square root of integer

Rate Square root without sqr

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(3(3 Vote))

Function sqroot(number As Integer) As Single
res = number / 2
Do
summed = (number - res * res) / (2 * res)
res = res + summed
Loop Until summed > -0.0001 And summed < 0.0001
Text2.Text = res
End Function
Private Sub Command1_Click()
sqroot (Int(Text1.Text))
End Sub