Question

How to round a number to the previous power of 2 in VB.NET

Answer 1

Imports System

Class Program
    Private Shared Function RoundToPreviousPowerOf2(ByVal n As Integer) As Integer
        If n <= 0 Then
            Return 0
        End If

        Return CInt(Math.Pow(2, Math.Floor(Math.Log(n, 2))))
    End Function

    Public Shared Sub Main()
        Dim num As Integer = 21
		
        Console.WriteLine($"Previous power of 2: {RoundToPreviousPowerOf2(num)}")
    End Sub
End Class


	
' run:
'
' Previous power of 2: 16
'

 

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