Bit Masking and math functions

[silhouett]

Id like to take a dec number and using masking as in And / OR etc be able to tell if a single binary bit in that dec number is on or off and to be able to set or unset that bit

for example

 

16 is actually 8 4 2 1 as binary positions go thus is there a math function that I could say do

1 1 1 1

 

16 (some operator) 8 and have it change to number 7 as I turned off the 8

! 1 1 1 1 0 0 0 0 1 1 1

and then do

 

16 (some operator) 8 and have it change back to 16 as I turned on the 16

! 1 1 1 1 0 0 0 ! 1 1 1

 

then also important is there a way I could mask the 16 to see if the 8 was on or off ?

I want to do this with 255 or 512 to be able to store flags in a Global variable thus cutting down the Global Variable usage.

[Carreau]

F4SE added bit masking to math.

 

https://www.creationkit.com/fallout4/index.php?title=Math_Script

 

Thereâs also bit shifting added.

 

https://www.creationkit.com/fallout4/index.php?title=LogicalAnd_-_Math

 

You can mask out the bits you donât care to know and use a single global to set flags as necessary.

Edited April 25, 2018 by Carreau

[bbiller]

I can help with this. You will need to covert this a bit for your scripting language, but this will work.

 

Bitarray= New Array(16);

Bittest= New Array(16);

T=16;

z=16;

K=0;

For (z=16;t>-1;t--)

{

Bitarray[z]=2^t;

z=z-1;

}

//This should set up the 512 array, biggest last. This next step will help when breaking down a variable.

 

Function var_split(var globalsets)

{

G=globalsets;

Splits= New Array (16);

Y=16;

D=16;

For(Y=16;Y>-1;Y--)

{

If (G=>Bitarray(Y))

{

Splits(Y)=1;

G=G-Bitarray(Y);

}

}

Return Splits;

}

 

Then all you have to do is feed the function the number variable. What picks up your flags will be the array created at the start. Example: Bittest=var_split(56);

 

 

Hope this helps, it is some lower level C, C++, or JavaScript coding. You can get some books on using arrays with the various programming languages pretty cheap, see w3c.org for the JavaScript coding (it's free).

[bbiller]

Adjust the t to T, my appologies.

[bbiller]

The Bitarray piece should be Bitarray[Y] .

[bbiller]

Splits gets a similar treatment.

[silhouett]

Thank you for the great feed back and examples. Great help.