Ordinary constants declarations are not different from the Turbo Pascal or Delphi implementation.
_________________________________________________________________________________________________________Constant declaration
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The compiler must be able to evaluate the expression in a constant declaration at compile time. This means that most of the functions in the Run-Time library cannot be used in a constant declaration. Operators such as +, -, *, /, not, and, or, div, mod, ord, chr, sizeof, pi, int, trunc, round, frac, odd can be used, however. For more information on expressions, see chapter 9, page 310. Only constants of the following types can be declared: Ordinal types, Real types, Char, and String. The following are all valid constant declarations:
Assigning a value to an ordinary constant is not permitted. Thus, given the previous declaration, the following will result in a compiler error:
Prior to version 1.9, Free Pascal did not correctly support 64-bit constants. As of version 1.9, 64-bits constants can be specified.