C#•3y ago

Union? of two binary arrays

Let's say we have two byte arrays:

byte[] ba1 = { 01, 01, 00, 00 };
byte[] ba2 = { 01, 00, 01, 00 };

byte[] ba1 = { 01, 01, 00, 00 };
byte[] ba2 = { 01, 00, 01, 00 };

I want to perform some operation on the arrays such that if the first byte in BOTH arrays is 0, then the resulting array's first byte is 0 but if EITHER byte is a 1, then the resulting array's first byte is a 1. (Extend this logic to each byte) Thus, the resulting array should be:

byte[] baRes = { 01, 01, 01, 00 }

byte[] baRes = { 01, 01, 01, 00 }

Is there any nice function that will do this for me?

27 Replies

Kouhai•3y ago

var res = ba1.Zip(ba2, (a, b) => a | b).ToArray();

var res = ba1.Zip(ba2, (a, b) => a | b).ToArray();

Unknown User•3y ago

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Kouhai•3y ago

So true, I miss linq when working with other langs 😅

Unknown User•3y ago

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Kouhai•3y ago

| is a bitwise OR So basically the example above is Return a or b

Unknown User•3y ago

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Kouhai•3y ago

If ba1[1] is 0, yes the output would be 0

Unknown User•3y ago

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Kouhai•3y ago

No, its return a or b Let's take a Boolean example var res = true or false What's the value of res?

Unknown User•3y ago

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Kouhai•3y ago

| operates on all numbers ofc, not just 01 and 00

Unknown User•3y ago

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Kouhai•3y ago

So 1 | 2 would equal 3 But 1 | 1 equals 1 And 123 | 123 == 123 ...etc If it's still confusing 😅 bitwise operations operate on bits

Unknown User•3y ago

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Kouhai•3y ago

No, that's not quite right 😅 byte a = 1 byte b = 3 A's binary 00000001 B's binary 00000011 The operations is basically this 00000001 | 00000011, it operations on each bit individually, so least significant bits are 1, the result's least significant bit is 1 as well, we move on to the next one, in B it's 1 in A it's 0, we set it to 1 in the result. The rest is 0 so it'll be set to 0 as well So the result's binary would be 00000011 which is 3 In the case of a = 1 b = 2 A 00000001 B 00000010 Does it make sense now 😅 ?

Unknown User•3y ago

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Kouhai•3y ago

No, 2 == b00000010, 3 == b00000011 Do you know how binary numbers work?

Unknown User•3y ago

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Kouhai•3y ago

That's okay 😅

Unknown User•3y ago

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Kouhai•3y ago

Yes, that's correct

Unknown User•3y ago

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Kouhai•3y ago

bitwise operations are used a LOT in low level code

Unknown User•3y ago

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Kouhai•3y ago

Things like encryption, embedded systems, graphics

Unknown User•3y ago

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Kouhai•3y ago

Gaming

Programming

Union? of two binary arrays