Get busy this weekend, with OR XOR AND [Excel Homework]
Some of you have heard my neighbor’s dog bark in a video or two that I recorded. While I was busy explaining how to do something awesome in Excel, this dog would decide to bark, adding her own two cents to the lesson. Quite a few of my VBA class students have grown used to it. So much that they complain when a lesson doesn’t have a couple of woofs. But I digress.
So coming back, one of the dogs (probably stray) has decided that she should bring her infant puppies and hide them under our terrace stair case. So, now we have 2 cute little puppies barking day long (and very late in to the night) just outside my office window. We have tried hard to get rid of them, but they somehow sneak back in and start barking or crying. So, I will be busy this weekend trying to move them out.
But that doesn’t mean, you have to live Excelless for a few days. So I have a homework.
OR XOR AND, Get busy this weekend!
Don’t worry. I am not speaking elvish or something. OR, XOR & AND stand for bitwise operations.
Binary?!? What binary?
As the saying goes, “There are 10 types of people in this world. Those who understand binary and those who don’t.”
If you understand the quotation, then you probably know what bitwise operations are. If not, then I guess you were too busy during highschool math lessons.
We are pretty comfortable dealing with regular numbers, those that have base 10.
Binary numbers are in base 2. That means, everything is a zero or one. So 5 becomes 101 (that is 1x2^{2}+0x2^{1}+1x2^{0} = 5
)
So what are bitwise operations?
Just as you have plus, minus, multiplication etc. there are few operations in binary world. See this illustration to understand what some of the basic bitwise operations mean:
What is the homework then?
Very simple, assuming 2 cells A1 & A2 have binary numbers in them,
What formulas you would write to produce the AND, OR & XOR of the numbers?
Notes:
 How would you write formulas if your numbers are less than 512?
 How would you write if the numbers are less than 65536?
 What would you do if the numbers are very very large?
Go ahead and post your answers
This is no ordinary exercise. But probably it will be easier than getting unwanted puppies out of your house. So go ahead and give this a try. And post your answers using comments. I am waiting.
Some Tips
 Comment by Cameron & subsequent discussion on how to convert binary numbers to decimal
 Chandoo.org Forum question on ANDing Binary numbers
 5 AND 3 is 1 by Daniel on Excel Hero
 Testing for EitherOr condition in Excel
 And oh yea, before I forget, never feed an unwanted puppy. If it becomes loyal to you, then are you in for trouble.
That is all. I wish you a pleasant weekend then. Mine is going to be noisy for sure.
 
 

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20 Responses to “Get busy this weekend, with OR XOR AND [Excel Homework]”
first solution for AND
The two numbers are in A1 and B1
= SUBSTITUTE (SUBSTITUTE (A1+B1*9*9, 9, 1), 8, 0)
regards
Stef@n
next solution for OR
=1*SUBSTITUTE (A1+A2;2;1)
regards
Stef@n
last solution for XOR
=1*SUBSTITUTE (A1+A2;2;0)
regards
Stef@n
Or you could make use of the VBA logical operators!
Define the following as custom functions
Public Function BITXOR(x As Long, y As Long)
BITXOR = x Xor y
End Function
Public Function BITAND(x As Long, y As Long)
BITAND = x And y
End Function
Public Function BITOR(x As Long, y As Long)
BITOR = x Or y
End Function
and then use them such:
A B =BITOR(A,B) =BITAND(A,B) =BITXOR(A,B)
0101 0100 0101 0100 0001
an another solution for AND
=1*SUBSTITUTE (SUBSTITUTE (A1+A2;1;0);2;1)
note:
the binary numbers are in A1 and A2 !
regards
Stef@n
I was obviously playing hooky at the beach during the bitwise math lesson – you lost me at “Understanding bitwise operations”
After looking at the above solutions, I find my solution silly, but still:
For the following formulae,
Row 1: headers,
Row 2: OR
Row 3: AND
Row 4: XOR
Column 1: Input 1
Column 2: Input 2
Column 3: Result
OR
{=SUM(IF(MID(A2,ROW(OFFSET($A$1,0,0,LEN(A2),1)),1)+MID(B2,ROW(OFFSET($A$1,0,0,LEN(B2),1)),1)>0,1,0)*10^(LEN(A2)ROW(OFFSET($A$1,0,0,LEN(B2),1))))}
AND
{=SUM(IF(MID(A3,ROW(OFFSET($A$1,0,0,LEN(A3),1)),1)+MID(B3,ROW(OFFSET($A$1,0,0,LEN(B3),1)),1)=2,1,0)*10^(LEN(A3)ROW(OFFSET($A$1,0,0,LEN(B3),1))))}
XOR
{=SUM(IF(MID(A4,ROW(OFFSET($A$1,0,0,LEN(A4),1)),1)+MID(B4,ROW(OFFSET($A$1,0,0,LEN(B4),1)),1)=1,1,0)*10^(LEN(A4)ROW(OFFSET($A$1,0,0,LEN(B4),1))))}
@Anup
Please don’t consider your solution silly
Firstly, You are the 3rd person to submit an answer
Secondly, The best formula/function is the one that you know and understand.
I think I have a very tedious solution, which people won’t have the patience to do except in small numbers.
I used the same problem setup as “Anup Agarwal”
AND =IF(AND(MID(B2,1,1)=”1″,MID(C2,1,1)=”1″),1,0)&IF(AND(MID(B2,2,1)=”1″,MID(C2,2,1)=”1″),1,0)&IF(AND(MID(B2,3,1)=”1″,MID(C2,3,1)=”1″),1,0)&IF(AND(MID(B2,4,1)=”1″,MID(C2,4,1)=”1″),1,0)
OR =IF(OR(MID(B3,1,1)=”1″,MID(C3,1,1)=”1″),1,0)&IF(OR(MID(B3,2,1)=”1″,MID(C3,2,1)=”1″),1,0)&IF(OR(MID(B3,3,1)=”1″,MID(C3,3,1)=”1″),1,0)&IF(OR(MID(B3,4,1)=”1″,MID(C3,4,1)=”1″),1,0)
=IF(OR(AND(MID(B4,1,1)=”1″,MID(C4,1,1)=”0″),AND(MID(B4,1,1)=”0″,MID(C4,1,1)=”1″)),1,0)&IF(OR(AND(MID(B4,2,1)=”1″,MID(C4,2,1)=”0″),AND(MID(B4,2,1)=”0″,MID(C4,2,1)=”1″)),1,0)&IF(OR(AND(MID(B4,3,1)=”1″,MID(C4,3,1)=”0″),AND(MID(B4,3,1)=”0″,MID(C4,3,1)=”1″)),1,0)&IF(OR(AND(MID(B4,4,1)=”1″,MID(C4,4,1)=”0″),AND(MID(B4,4,1)=”0″,MID(C4,4,1)=”1″)),1,0)
Sorry my last post was totally messed up
AND
=IF(AND(MID(B2,1,1)=”1″,MID(C2,1,1)=”1″),1,0)&IF(AND(MID(B2,2,1)=”1″,MID(C2,2,1)=”1″),1,0)&IF(AND(MID(B2,3,1)=”1″,MID(C2,3,1)=”1″),1,0)&IF(AND(MID(B2,4,1)=”1″,MID(C2,4,1)=”1″),1,0)
OR
=IF(OR(MID(B3,1,1)=”1″,MID(C3,1,1)=”1″),1,0)&IF(OR(MID(B3,2,1)=”1″,MID(C3,2,1)=”1″),1,0)&IF(OR(MID(B3,3,1)=”1″,MID(C3,3,1)=”1″),1,0)&IF(OR(MID(B3,4,1)=”1″,MID(C3,4,1)=”1″),1,0)
XOR
=IF(OR(AND(MID(B4,1,1)=”1″,MID(C4,1,1)=”0″),AND(MID(B4,1,1)=”0″,MID(C4,1,1)=”1″)),1,0)&IF(OR(AND(MID(B4,2,1)=”1″,MID(C4,2,1)=”0″),AND(MID(B4,2,1)=”0″,MID(C4,2,1)=”1″)),1,0)&IF(OR(AND(MID(B4,3,1)=”1″,MID(C4,3,1)=”0″),AND(MID(B4,3,1)=”0″,MID(C4,3,1)=”1″)),1,0)&IF(OR(AND(MID(B4,4,1)=”1″,MID(C4,4,1)=”0″),AND(MID(B4,4,1)=”0″,MID(C4,4,1)=”1″)),1,0)
@stefan,
I just couldn’t get your solutions to work.
01010101010 + 01010101110 = 02020210120
what am i doing wrong?
@anup
…I got yours to work!
@Stephen – I get the same, but Stef@an’s second solution for AND does work (at least for the test cases I used)
@ Stephen / Rich
yes , you are right ! – only this works:
OR
=1*SUBSTITUTE (A1+A2;2;1)
XOR
=1*SUBSTITUTE (A1+A2;2;0)
AND
=1*SUBSTITUTE (SUBSTITUTE (A1+A2;1;0);2;1)
@Stef@n – You’re answer is really smart, I never knew about the substitute function before. Great Work!
Thx Michael
yes – it is simply easy
if you add 1 and 1 – excel calculate 2
and then you have to substitute the 2 – new = 0 respectively 1
Here is a good resource for people wanting to learn binary and hexadecimal.
http://justwebware.com/bitwise/bitwise.html
Three that weren’t asked for:
NOT
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1+A2,0,3),1,0),3,1)
EQV
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1+A2,0,3),2,3),1,0),3,1)
IMP
=SUBSTITUTE(SUBSTITUTE(A1+SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A2,0,3),1,0),3,1),0,1),2,0)
(was using Daniel Ferry’s bitwise file to verify against)
@ Kyle
Not only takes one parameter and inverts 0 1 and 10
Took out the +A2
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,0,3),1,0),3,1)
Great solutions!
I’ll add two:
NAND =1*SUBSTITUTE (A1+A2,2,0)
NOR=1*SUBSTITUTE(SUBSTITUTE (SUBSTITUTE(A1+A2,0,2),1,0),2,1)