Question

How to determining if an integer is a power of 2 in VB.NET

Answer 1

Imports System

Public Class Test
    Public Shared Sub Main()
        Dim n as Integer = 16
            
        Console.WriteLine(Convert.ToString(n, 2).PadLeft(8, "0"C))
        Console.WriteLine(Convert.ToString(n - 1, 2).PadLeft(8, "0"C))
        Console.WriteLine(Convert.ToString(n AND (n - 1), 2).PadLeft(8, "0"C))

        Dim b as Boolean =  (n And (n - 1)) = 0
   
        Console.WriteLine(b)
    End Sub
End Class


'run:

' 00010000
' 00001111
' 00000000
' True

 

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