bit masking tutorial

How to learn bitmasking?
General way to implement Bitmasking:
Establish the list or array's size to determine how many bits you'll need for the binary representation.
Check the corresponding bits for each index, then carry out the required operation based on their values.
How does bitmask work?
How bitmasks works.
Masking employs the bitwise OR and AND operations to encode and decode values respectively.
New composite values are created by a bitwise OR of the original composite and the predefined flag.
Similarly, the bitwise AND of a composite and a particular flag validates the presence / absence of the flag
What is bit masking with example?
Bits and Bit-masking: An Intro.
A bit is a single Boolean value (0 or 1), small set(s) of which makes a bit-mask.
A bit is said to be set if and only if it is '1'.
For eg: in 10011, 1st, 2nd and 5th bits are set while 3rd and 4th are not.
In a bit mask, Bitwise AND can be used to make sure particular bits in the result value are set to 0.
The trick is to put a 1 in the mask for any bit you do not want changed in the result, and a 0 in the mask for any bit that you want to make sure is a 0 in the result.

Setting Bit N

Setting bit n is as simple as ORing the value of the storage variable with the value 2^n. storage = 1 << n; As an example, here is the setting of bit 3 where storageis a char (8 bits): 01000010 OR00001000 ==01001010 The 2^nlogic places the '1' value at the proper bit in the mask itself, allowing access to that same bit in the storage variable. learn-c.org

Clearing Bit N

Clearing bit n is the result of ANDing the value of the storage variable with the inverse (NOT) of the value 2^n: storage &= ~(1 << n); Here's the example again: 01001010 AND11110111 ==01000010 learn-c.org

Flipping Bit N

Flipping bit n is the result of XORing the value of the storage variable with 2^n: storage ^= 1 << n; 01000010 01001010 XOR XOR00001000 00001000 == ==01001010 01000010 learn-c.org

Checking Bit N

Checking a bit is ANDing the value of 2^nwith the bit storage: bit = storage & (1 << n); 01000010 01001010 AND AND00001000 00001000 == ==00000000 00001000 learn-c.org

What are Bit Masks and how do I use them? (examples in C)

Bit Masking Explained with Examples (How to Set a Bit How to Get a Bit)

PDF	Bitmasks This is done via bit masks i.e.

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