ABL electronic PIC12 Benutzerhandbuch

Type qualifiers 

const

and 

volatile

are optional in declarations and do not actu-

ally affect the type of declared object.

Qualifier 

const

implies that the declared object will not change its value during

runtime. In declarations with 

const

qualifier, you need to initialize all the objects

in the declaration.

Effectively, mikroC treats objects declared with 

const

qualifier same as literals or

preprocessor constants. Compiler will report an error if trying to change an object
declared with 

const

qualifier.

For example:

double PI = 3.14159;

Qualifier 

volatile

implies that variable may change its value during runtime

indepent from the program. Use the 

volatile

modifier to indicate that a variable

can be changed by a background routine, an interrupt routine, or an I/O port.
Declaring an object to be volatile warns the compiler not to make assumptions
concerning the value of the object while evaluating expressions in which it occurs
because the value could change at any moment.

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mikroC - C Compiler for Microchip PIC microcontrollers

mikroC

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