A21 Integral types in Software

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A21 Integral types
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C++ inherits from C a bewildering variety of integral types, including integers, Boolean, and character types Because C++ is intended to be able to run efficiently on a wide variety of hardware, it leaves many of the details of its fundamental types up to the implementation rather than defining those types precisely
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A211 Integer
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There are three distinct signed integer types and three distinct unsigned integer types:
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short int unsigned short int int unsigned int long int unsigned long int
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The short and long types can be abbreviated by dropping the keyword int The keywords, if there are more than one, can appear in any order Each of these types is capable of representing any integer within an implementation- defined range Each type but the first must offer a range at least as generous as that of the type that precedes it The ranges for short int and int must be at least 32767 ( (215 -1)), and the range for long int must be at least 2147483647 ( (231 -1)) Every signed integral type has a corresponding unsigned type Every unsigned type represents integers modulo 2n, where n depends on the type and the implementation Analogous to the signed types, the n that corresponds to every unsigned type except unsigned char must be at least as large as the n for the preceding type Moreover, every unsigned type must be capable of holding every non-negative value in the range of the corresponding signed type, and each signed type is required to have the same internal representation as the corresponding unsigned type for the values that they have in common It follows from these requirements that the four unsigned types must have an extra bit that corresponds to signed types' sign bits, meaning that the unsigned types must correspond to values of n that are at least 8, 16, 16, and 32 respectively Compilers are allowed to use either one's- or two's-complement representation for the signed types The standard library defines a type called size_t that is a synonym for one of the unsigned types It is guaranteed to be large enough to hold the size of the largest possible object, including arrays Its type is defined in the system header <cstddef>
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Integer literals: An integer literal is a sequence of digits, optionally preceded by a base indicator, and optionally followed by a size indicator Pedantically speaking, integer literals do not have signs, so that -3 is an expression, not a literal If the literal begins with 0x or 0X, then the integer is represented in hexadecimal, and the "digits" can include any of AaBbCcDdEeFf as well as the usual decimal digits If the literal begins with a 0 that is not followed by x or X, then the integer is represented in octal, and the "digits" can include only 01234567 The size indicator is u, l, ul, or lu, in either upper- or lowercase If it is lu or ul, then the literal has type unsigned long If it is u, then the literal has type unsigned if the value will fit; otherwise, it has type unsigned long If it is l, then the literal has type long if the value will fit; otherwise, it has type unsigned long If there is a base indicator but no size indicator, then the type is the first of int, unsigned, long, and unsigned long into which the value will fit If there is neither a size nor a base indicator, then the type is int if the value will fit, and long otherwise These rules imply that the type of an integer literal often depends on the implementation Fortunately, integer literals in well-written programs tend to be small, so these details don't matter most of the time Nevertheless, we have mentioned them in case you need to refer back to them
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