mikroC
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DECLARATIONS
mikroC - C Compiler for Microchip PIC microcontrollers
Introduction to Declarations
Declaration introduces one or several names to a program – it informs the compiler what the name represents, what is its type, what are allowed operations with it, etc. This section reviews concepts related to declarations: declarations, definitions, declaration specifiers, and initialization.
The range of objects that can be declared includes:
-Variables
-Constants
-Functions
-Types
-Structure, union, and enumeration tags
-Structure members
-Union members
-Arrays of other types
-Statement labels
-Preprocessor macros
Declarations and Definitions
Defining declarations, also known as definitions, beside introducing the name of an object, also establish the creation (where and when) of the object; that is, the allocation of physical memory and its possible initialization. Referencing declara- tions, or just declarations, simply make their identifiers and types known to the compiler.
Here is an overview. Declaration is also a definition, except if:
-it declares a function without specifying its body,
-it has an extern specifier, and has no initializator or body (in case of func.),
-it is a typedef declaration.
There can be many referencing declarations for the same identifier, especially in a multifile program, but only one defining declaration for that identifier is allowed.
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MikroElektronika: Development tools - Books - Compilers | 85 | |
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