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All variables have a type. Free Pascal supports the same basic types as Turbo
Pascal, with some extra types from Delphi.
You can declare your own types, which is in essence defining an identifier
that can be used to denote your custom type when declaring variables further
in the source code.
Type declaration
There are 7 major type classes :
Types
The last class, type identifier, is just a means to give another
name to a type. This gives you a way to make types platform independent, by
only using your own types, and then defining these types for each platform
individually. The programmer that uses your units doesn't have to worry
about type size and so on. It also allows you to use shortcut names for
fully qualified type names. You can e.g. define system.longint as
Olongint and then redefine longint.
Subsections
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1999-06-10