hi all

im trying to write a code to find number of zeros of 100! but cant get it to work properly?
help would be good
heres the code ive done so far

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i As Integer = 0
        Dim num As Integer = 0
        Dim start As Integer = 0
        Dim theend As Integer = 100


        While (start <= 100)

            num = start
            While (start Mod 5 = 0)
                start = start / 5
                i += 1

            End While
            start = num

            While (start Mod 2 = 0)

                start = start / 2
                start += 1

            End While

        End While

        Label1.Text = i





    End Sub
End Class

First of all, all numeric variable types initialize to 0. Your initializations are unnecessary.
You never use theend
You sould think about posing questions in proper capitalization and punctuation (notably, apostrophes...)
If you mean the number of zeroes [u]in</u>, that's actually much easier with strings.
Convert 100 to "100", and then examine each character for "0".

Start starts as 0. 0 Mod 5 = 0, so the while happens.
0 / 5 = 0, so start stays as 0
i gets incremented.
The while compares 0 Mod 5 again. and again. and again. Until i overflows.

Could you explain in a little more detail (and a little better writing) what it is that you want to do, and include what your results so far have been?