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High Byte

Posted on 1997-12-03
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Last Modified: 2008-02-20
I need to split and integer in to bytes.

I have suceded getting the low byte doing a bitwise AND with 255.

How can i get the high byte of an integer??
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Question by:PedroMVGomes
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mrmick earned 50 total points
ID: 1443381
Function HiByte(Pass As Integer) As Byte

   If (Pass And -2 ^ 15) = 0 Then
      HiByte = Int(Pass / 255)
   Else
      HiByte = ((Pass And 32512) \ 256) Or 128
   End If

End Function

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by:mrmick
ID: 1443382
Simplified a bit...

Function HiByte(i As Integer) As Byte

   If i And -2 ^ 15 Then
      HiByte = ((i And 32512) \ 256) Or 128
   Else
      HiByte = i \ 255
   End If

End Function

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Expert Comment

by:mrmick
ID: 1443383
or how about this...

Function HiByte(i As Integer) As Byte
Dim Sign As Boolean

   Sign = i And -2 ^ 15
   HiByte = ((i And 32512) \ 256) Or (128 And Sign)

End Function

Note: All three work!

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Expert Comment

by:alamo
ID: 1443384
yes, yet another way, and without stripping the sign bit first

In case you'd like to see it in decimal:

Function HiByte(i As Integer) As Byte

   HiByte = (i And 65280) / 256 And 255

End Function



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LVL 8

Expert Comment

by:mrmick
ID: 1443385
How can i do the reverse, this is i have to bytes the low one and the higher one how can a calculate the integer??
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