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SET / RESET bit in byte ?

Started by paja, March 02, 2010, 05:32:55 PM

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paja

March 02, 2010, 05:32:55 PM
Hi,

How can I SET or RESET bit in byte ?

sapero

March 02, 2010, 07:44:54 PM #1
Code Select
UINT value = 0

' set 20 bits:  11111111 11111111 10000100 00100001
value |= 0xFFFF8421 ' value is 0xFFFF8421

' toggle one bit 00000000 00000000 00000000 00000001
value = value ^ 1   ' value is 0xFFFF8420

' reset 3 bits
' bits to be reset: 11100000 00000000 00000000 00000000
' mask:             00011111 11111111 11111111 11111111
value &= 0x1FFFFFFF ' value is 0x1FFF8420

ckoehn

March 03, 2010, 11:26:24 AM #2
I think this should work.

Code Select
SUB SetBit(INT v BYREF, INT vbit BYVAL)
INT mb
mb=2^bit
v|=mb
ENDSUB

SUB ResetBit(INT v BYREF, INT vbit BYVAL)
INT mb
mb = 0xFFFFFF-(2^vbit)
v &= mb
ENDSUB
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