pascal.md: update

articles/pascal.md

@@ -4,11 +4,37 @@ Pascal is a procedural programming language created by [Niklaus Wirth](niklaus_w
 Pascal was a popular choice for microcomputers in the 70's and 80's, even more popular than C initially (C was still quite an UNIX-only language)
 due to its simple design, which allowed fast simple single-pass compilers.
 
+In its "vanilla" form, Pascal is not any more complex than C, aside from having features that C doesn't have, such as range types
+and nested procedures.
+
 ## Compilers
 - [FPC](https://www.freepascal.org/) (Free Pascal Compiler): currently the most popular Pascal compiler with wide support
 for different OSes and architectures, libre software.
-- Turbo Pascal: old compiler for DOS systems, proprietary
-- Delphi: proprietary, adds [OOP](oop.md) bloat
+- Turbo Pascal: old compiler for DOS systems, proprietary.
+- Delphi: proprietary, adds [OOP](oop.md) bloat and exception handling.
+
+## Notes
+### Returning values from functions
+```pascal
+{ The "classical" way, assigning the return value to the function name }
+function Square(n: integer): integer;
+begin
+    Square := n * n; 
+end;
+
+{ Object Pascal and Delphi, assigning to special `Result` variable }
+{ Enable with `-S2` in FPC }
+function Square(n: integer): integer;
+begin
+    Result := n * n; 
+end;
+
+{ Return statement like }
+function Square(n: integer): integer;
+begin
+    Exit(n * n);
+end;
+```
 
 ## Examples
 ### Hello world
@@ -68,6 +94,7 @@ end.
 
 ## Resources
 - [Free Pascal Wiki](https://wiki.freepascal.org/Main_Page)
+- [Basic Pascal Tutorial](https://wiki.freepascal.org/Basic_Pascal_Tutorial)
 - *Why Pascal is Not My Favorite Programming Language* by Brian Kernighan, mostly of historic interest as almost all of the
 flaws described in the article has been fixed by modern Pascal compilers. <https://www.lysator.liu.se/c/bwk-on-pascal.html>