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Constants Define Constants Program Section
Standard Pascal allows you to define constants in your program or
subprogram. A constant is NOT a pre-initialized variable. It is just a
name that can be used in place of the corresponding value. Constants
cannot be passed as VAR parameters, nor can they be assigned values.
They can be used to delimit subranges (types, array indices, sets) and
also be used in CASE statements.
Constants are declared in the declaration section of the program or
subprogram. A list of constants is preceded by the word CONST and uses
the following syntax:
const
<cname> = <cvalue>;
<cname> = <cvalue>;
{ etc. }
where <cname> is any legal identifier and <cvalue> is a literal value
of type Integer, Real, Char, Boolean, or string.
In Standard Pascal, you can have only one CONST section in a program
(or subprogram), and it must come after the LABEL section and before
the TYPE section. In Turbo Pascal, you can have as many CONST sections
as you want, and there are no ordering restrictions.
-------------------------------- Example ---------------------------------
const
Limit = 100;
Yes = True;
Bell = ^G; { = Ctrl-G }
e = 2.7182818285;
FileName = 'C:\MYSTUFF.TXT';
See Also:
const
types
variables
typed constants
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