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Forum Index : Microcontroller and PC projects : Logical NOT not working as expected

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JohnL
Senior Member

Joined: 10/01/2014
Location: Seychelles
Posts: 128
Posted: 01:47pm 25 Dec 2015
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Micromite Plus Firmware 4.07.

NOT 0 returns 1 as expected, single bit.

Logical NOT returns 0 for all other values?

I would expect NOT to work in BASIC with at least a 16 bit integer (0 - &HFFFF)

If NOT only works with a single bit than it is almost useless in BASIC?


 
TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6283
Posted: 03:09pm 25 Dec 2015
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AND, OR and XOR are integer bitwise operators so you can usually use XOR to get a bitwise NOT.

NOT is useful in IF statements.

Jim
VK7JH
MMedit
 
JohnL
Senior Member

Joined: 10/01/2014
Location: Seychelles
Posts: 128
Posted: 04:57pm 25 Dec 2015
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Thanks Jim,

That works.

Just to clarify for anyone else that does not know the details.

If you want to invert (NOT) a 16 bit integer using XOR.

you have to XOR the number with &HFFFF.

Regards
John
 
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