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The following summarizes the language-related environmental limits on a conforming implementation; the library-related limits are discussed in clause 7. 1 Translation limits 1 The implementation shall be able to translate and execute at least one program that contains at least one instance of every one of the following limits:13) — 127 nesting levels of blocks — 63 nesting levels of conditional inclusion — 12 pointer, array, and function declarators (in any combinations) modifying an arithmetic, structure, union, or incomplete type in a declaration — 63 nesting levels of parenthesized declarators within a full declarator — 63 nesting levels of parenthesized expressions within a full expression — 63 significant initial characters in an internal identifier or a macro name (each universal character name or extended source character is considered a single character) — 31 significant initial characters in an external identifier (each universal character name specifying a short identifier of 0000FFFF or less is considered 6 characters, each universal character name specifying a short identifier of 00010000 or more is considered 10 characters, and each extended source character is considered the same number of characters as the corresponding universal character name, if any)14) 13) Implementations should avoid imposing fixed translation limits whenever possible.

19 The void type comprises an empty set of values; it is an incomplete type that cannot be completed. 36) Array types are characterized by their element type and by the number of elements in the array. An array type is said to be derived from its element type, and if its element type is T , the array type is sometimes called ‘‘array of T ’’. The construction of an array type from an element type is called ‘‘array type derivation’’. — A structure type describes a sequentially allocated nonempty set of member objects (and, in certain circumstances, an incomplete array), each of which has an optionally specified name and possibly distinct type.

2 Integer types 1 For unsigned integer types other than unsigned char, the bits of the object representation shall be divided into two groups: value bits and padding bits (there need not be any of the latter). If there are N value bits, each bit shall represent a different power of 2 between 1 and 2 N −1 , so that objects of that type shall be capable of representing values from 0 to 2 N − 1 using a pure binary representation; this shall be known as the value representation. 44) 2 For signed integer types, the bits of the object representation shall be divided into three groups: value bits, padding bits, and the sign bit.

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