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C Language > Learn C Language > What is meant by "bit masking"?
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What is meant by "bit masking"?

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Programming Languages & Electronics Tutor.

Mask means to block in bit masking, blocking can be done by bit by bit e.g. 0101 1000 OR -------------- 1101
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bitwise and with 1.
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Doing mathematics & computing from IIT Delhi

"bit masking" means multiply the number by a matrix of bits.
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Bit masking means selecting only certain bits from byte(s) that might have many bits set. To examine some bits of a byte, the byte is bitwise “ANDed” with a mask that is a number consisting of only those bits of interest. For instance, to look at the one’s digit (rightmost digit) of the variable...
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Bit masking means selecting only certain bits from byte(s) that might have many bits set. To examine some bits of a byte, the byte is bitwise “ANDed” with a mask that is a number consisting of only those bits of interest. For instance, to look at the one’s digit (rightmost digit) of the variable flags, you bitwise AND it with a mask of one (the bitwise AND operator in C is &): flags & 1; To set the bits of interest, the number is bitwise “ORed” with the bit mask (the bitwise OR operator in C is |). For instance, you could set the one’s digit of flags like so: flags = flags | 1; Or, equivalently, you could set it like this: flags |= 1; To clear the bits of interest, the number is bitwise ANDed with the one’s complement of the bit mask. The “one’s complement” of a number is the number with all its one bits changed to zeros and all its zero bits changed to ones. The one’s complement operator in C is ~. For instance, you could clear the one’s digit of flags like so: flags = flags & ~1; Or, equivalently, you could clear it like this: flags &= ~1; read less
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For example if you want to know if third bit is 1 or not for an int x then you can mask all other bits and just check the third one: (n & 0x04) != 0 means 3rd bit is not zero, 0x04 is the bit mask
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Bit masking means selecting only certain bits from byte(s) that might have many bits set. To examine some bits of a byte, the byte is bitwise “ANDed” with a mask that is a number consisting of only those bits of interest.
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