CHAPTER 15BIT FIDDLING

You will learn about the following in this chapter:

• Operators:

~ & |^

>> <<

&= |= ^= >>= <<=

• Binary, octal, and hexadecimal number notations (a review)

• Two C facilities for handling the individual bits in a value: bitwise operators and bit fields

With C, you can manipulate the individual bits in a variable. Perhaps you are wondering why anyone would want to. Be assured that sometimes this ability is necessary, or at least useful. For example, a hardware device is often controlled by sending it a byte or two in which each bit has a particular meaning. Also, operating system information about files is often stored by using particular bits to indicate particular items. Many compression and encryption operations manipulate ...

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