Mikroelektronika MIKROE-742 데이터 시트

Constant is a data whose value cannot be changed during the runtime. Using a con-
stant in a program consumes no RAM. Constants can be used in any expression,
but cannot be assigned a new value.

Constants are declared in the declaration part of a program or routine. You can
declare any number of constants after the keyword const:

const constant_name [: type] = value;

Every constant is declared under unique 

constant_name

which must be a valid

identifier. It is a tradition to write constant names in uppercase. Constant requires
you to specify 

value

, which is a literal appropriate for the given type. 

type

is option-

al and in the absence of type, the compiler assumes the “smallest” of all types that
can accommodate 

value

.

Note: You cannot omit type when declaring a constant array.

Pascal allows shorthand syntax with only one keyword 

const

followed by multiple

constant declarations. Here’s an example:

MAX : longint = 10000;

MIN = 1000;      // compiler will assume word type
SWITCH = 'n';    // compiler will assume char type

MSG = 'Hello';   // compiler will assume string type

MONTHS : 

array[1..12] 

byte =

(31,28,31,30,31,30,31,31,30,31,30,31);

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 5