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Tip of the Day
Language: VB4,VB5,VB6,VBS
Expertise: beginner
Jul 3, 1999

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Bin - Convert from decimal to binary

' convert from decimal to binary
' if you pass the Digits argument, the result is truncated
' to that number of digits
'
' NOTE: requires Power2()

Function Bin(ByVal value As Long, Optional digits As Long = -1) As String
    Dim result As String, exponent As Integer
    ' this is faster than creating the string by appending chars
    result = String$(32, "0")
    Do
        If value And Power2(exponent) Then
            ' we found a bit that is set, clear it
            Mid$(result, 32 - exponent, 1) = "1"
            value = value Xor Power2(exponent)
        End If
        exponent = exponent + 1
    Loop While value
    If digits < 0 Then
        ' trim non significant digits, if digits was omitted or negative
        Bin = Mid$(result, 33 - exponent)
    Else
        ' else trim to the requested number of digits
        Bin = Right$(result, digits)
    End If
End Function
Francesco Balena
 
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