Imports System
Public Class Test
Public Shared Function getTheHighestDigit(n As Integer) As Integer
Dim max As Integer = 0
Do While(n <> 0)
If (n Mod 10 > max) Then
max = n Mod 10
End If
n = Int(n / 10)
Loop
return max
End Function
Public Shared Sub Main()
Dim n As Integer = 213
Console.WriteLine(getTheHighestDigit(n))
n = 76594
Console.WriteLine(getTheHighestDigit(n))
n = 76852
Console.WriteLine(getTheHighestDigit(n))
End Sub
End Class
' run
'
' 3
' 9
' 8