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Unformatted text preview: .8, these different sizes allow different ranges of values to be represented. The C standard deﬁnes a minimum range of values each data type must be able to represent. As shown in the ﬁgure, a typical 32-bit machine uses a 32-bit representation for data types int and unsigned, even though the C standard allows 16-bit representations. As described in Figure 2.2, the Compaq Alpha uses a 64-bit word to represent long integers, giving an upper limit of over ½ ¢ ½¼½ for unsigned values, and a range of over ¦ ¾¾ ¢ ½¼½ for signed values.
New to C? Both C and C++ support signed (the default) and unsigned numbers. Java supports only signed numbers. End 2.2.2 Unsigned and Two’s Complement Encodings
Assume we have an integer data type of Û bits. We write a bit vector as either Ü, to denote the entire vector, or as ÜÛ ½ ÜÛ ¾ Ü¼ to denote the individual bits within the vector. Treating Ü as a number written in binary notation, we obtain the unsigned interpretation of Ü. We express this interpretat...
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