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This page was last edited on 24 June 2020, at 18:56 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The C language provides the four basic arithmetic type specifiers char, int, float and double (as well as the boolean type bool), and the modifiers signed, unsigned, short, and long. The following table lists the permissible combinations in specifying a large set of storage size-specific declarations.
C also provides a special type of member known as a bit field, which is an integer with an explicitly specified number of bits. A bit field is declared as a structure (or union) member of type int, signed int, unsigned int, or _Bool, [note 4] following the member name by a colon (:) and the number of bits it should occupy. The total number of ...
[1] The storage-class specifier auto can be added to these variable declarations as well, but as they are all automatic by default, this is entirely redundant and rarely done. In C, using the storage class register is a hint to the compiler to cache the variable in a processor register.
shared is used for shared data in multi-threading (as volatile was briefly used for in C++). inout is a wildcard used to allow functions that do not modify data (and thus are only concerned with the unqualified type of the data) to return the same qualified type as the input. const and immutable can also be used as storage class specifiers.
In the C programming language, register is a reserved word (or keyword), type modifier, storage class, and hint. The register keyword was deprecated in C++, until it became reserved and unused in C++17. It suggests that the compiler stores a declared variable in a CPU register (or some other faster location) instead of in random-access memory.
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The term closure is often used as a synonym for anonymous function, though strictly, an anonymous function is a function literal without a name, while a closure is an instance of a function, a value, whose non-local variables have been bound either to values or to storage locations (depending on the language; see the lexical environment section below).