A computer "byte" consists of eight "bits," each bit being either a 0 or a 1. If characters are represented using a code that uses a byte for each character, how many different characters can be represented?
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The bit is a basic unit of information in information theory, computing, and digital communications. The name is a portmanteau of binary digit.[1]
In information theory, one bit is typically defined as the information entropy of a binary random variable that is 0 or 1 with equal probability,[2] or the information that is gained when the value of such a variable becomes known.[3][4] As a unit of information, the bit is also known as a shannon,[5]named after Claude E. Shannon.
As a binary digit, the bit represents a logical state, having only one of two values. It may be physically implemented with a two-state device. These values are most commonly represented as either 0or1, but other representations such as true/false, yes/no, +/−, or on/off are common. The correspondence between these values and the physical states of the underlying storage or device is a matter of convention, and different assignments may be used even within the same device or program.
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