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An external variable can be accessed by all the functions in all the modules of a program. It is a global variable.For a function to be able to use the variable, a declaration or the definition of the external variable must lie before the function definition in the source code.
stdarg.h is a header in the C standard library of the C programming language that allows functions to accept an indefinite number of arguments. [1] It provides facilities for stepping through a list of function arguments of unknown number and type. C++ provides this functionality in the header cstdarg.
Such extern declarations are often placed in a shared header file, since it is common practice for all .c files in a project to include at least one .h file: the standard header file errno.h is an example, making the errno variable accessible to all modules in a project.
Using #pragma once allows the C preprocessor to include a header file when it is needed and to ignore an #include directive otherwise. This has the effect of altering the behavior of the C preprocessor itself, and allows programmers to express file dependencies in a simple fashion, obviating the need for manual management.
SP1 version (16.00.40219) is available as part of Visual Studio 2010 Service Pack 1 or through the Microsoft Visual C++ 2010 Service Pack 1 Compiler Update for the Windows SDK 7.1. [42] Visual C++ 2012 (also known as Visual C++ 11.0) was released on August 15, 2012. It features improved C++11 support, and support for Windows Runtime development ...
In the predecessors of C, including BCPL and B, there was already a concept of static storage., [1] [2] which meant a storage which is always in existence. However, In B, there wasn't a static keyword, but there was an extrn keyword to specify external storage (external to all functions and must be defined outside a function), which is always static, in contrast with auto keyword, which ...
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 computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.