Plus programming language is a historical programming language created in 1976.

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Example code from Wikipedia:

%Title := "Hello world";
%Subtitle := "Definitions";
%Lower_Case := True;

/* Definitions that everyone needs */
%Include(Boolean, Numeric_Types, More_Numeric_Types, String_Types,

/* A tasteful subset of procedure definitions */

/* Message routine definitions */
%Include(Message_Initialize, Message, Message_Terminate);

%Subtitle := "Local Procedure Definitions";
definition Main

  variable Mcb is pointer to Stream_Type;

  Mcb := Message_Initialize();
  Message(Mcb, "Hello, world!");
  Mcb := Null;
end Main;

Last updated February 11th, 2019