Simula

Simula is a programming language created in 1965 by Ole-Johan Dahl.

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Simula is the name of two simulation programming languages, Simula I and Simula 67, developed in the 1960s at the Norwegian Computing Center in Oslo, by Ole-Johan Dahl and Kristen Nygaard. Syntactically, it is a fairly faithful superset of ALGOL 60. Simula 67 introduced objects, classes, inheritance and subclasses, virtual procedures, coroutines, and discrete event simulation, and features garbage collection. Read more on Wikipedia...

Simula Wikipedia page
Simula docs
Simula first developed in Norwegian Computing Center
Explore Simula snippets on Rosetta Code
Simula on HOPL
Simula appears in the TIOBE Index
See also: (9 related languages)ALGOL 60, Object Pascal, Java, C#, Algol, Smalltalk, BETA, DOI, ISBN

Example from hello-world:

Begin
   OutText ("Hello World");
   Outimage;
End;

Example from the Hello World Collection:

! Hello World in Simula;

BEGIN
    OutText("Hello World!");
    OutImage;
END

Example from Wikipedia:

Simulation Begin
   Class FittingRoom; Begin
      Ref (Head) door;
      Boolean inUse;
      Procedure request; Begin
         If inUse Then Begin
             Wait (door);
             door.First.Out;
         End;
         inUse:= True;
      End;
      Procedure leave; Begin
         inUse:= False;
         Activate door.First;
      End;
      door:- New Head;
   End;
  
   Procedure report (message); Text message; Begin
      OutFix (Time, 2, 0); OutText (": " & message); OutImage;
   End;

   Process Class Person (pname); Text pname; Begin
      While True Do Begin
         Hold (Normal (12, 4, u));
         report  (pname & " is requesting the fitting room");
         fittingroom1.request;
         report (pname & " has entered the fitting room");
         Hold (Normal (3, 1, u));
         fittingroom1.leave;
         report (pname & " has left the fitting room");
      End;
   End;

   Integer u;
   Ref (FittingRoom) fittingRoom1;

   fittingRoom1:- New FittingRoom;
   Activate New Person ("Sam");
   Activate New Person ("Sally");
   Activate New Person ("Andy");
   Hold (100);
End;

Feature	Supported	Token	Example
Booleans	✓	True False
Strings	✓	"	"Hello world"
Assignment	✓	:=
Print() Debugging	✓	OutText
Line Comments	✓	!	! A comment
Comments	✓
Semantic Indentation	X

Simula - Programming language

Language features