What are constants?

Constants can be character literals, string literals, integers, real numbers, or constant identifiers.

Constant identifiers are identifiers that have been associated with a constant by a constant definition or by an enumerated type definition.

Example

Here is an example of a constant definition group:

const
   Space = ' ';
   message = 'Hello';
   first = 1;
   last = 10;
   DaysInYear = 365.25;
   minint = -maxint;
   linefeed = #10;