Question

How to extract the last N bits of a 32-bit integer in VB.NET

Answer 1

Imports System
  
Public Class myProgram
    Private Shared Function get_last_N_bits(ByVal number As Integer, ByVal N As Integer) As Integer
		Dim mask As Integer = (1 << N) - 1
		
		Return number AND mask
    End Function

	Public Shared Sub Main()
        Dim number As Integer = 441 ' 00000001101-11001
        Dim N As Integer = 5
          
        Console.WriteLine(Convert.ToString(number, 2).PadLeft(16, "0"c))
          
        Dim lastNbits As Integer = get_last_N_bits(number, N)
          
        Console.WriteLine(Convert.ToString(lastNbits , 2).PadLeft(16, "0"c))
    End Sub
End Class
  
  
  
' run:
'
' 0000000110111001
' 0000000000011011
'

 

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