NDLI: Object oriented programming, tutorial

Please wait, while we are loading the content...

Volume 20, Issue 4, July 1990

SRS service report system

Neural networks in APL

Object oriented programming, tutorial

Integrating APL with symbol manipulation, numerical software and graphics

Conscientious programming using PMA

Nonce functions

ACORN: APL to C on real numbers

Definition of image interpretation strategies in APL

Preliminary mesh checking for structural analysis

Automatic parallelization of APL-style programs

Analytic response time model for distributed systems

APL as the foundation for a universal computer language

Technical support program for APL related question

A structured approach to analysis and design of complex systems

Angiogram analysis in APL: a case study

APL2 analysis and design of mortgage backed securities

Editing and debugging with Windows and a mouse

Color APL beautiful!

Musical syntactic and semantic structures in APL2

An APL-simulator of non-Von Neumann computer architectures

The A+ programming language, a different APL

Arrays and references

Markov processes in APL

Sparse matrix technology tools in APL

APL for economic and management control in KTAS

The family of Soviet APL systems

An application development platform

The travelling salesman problem, revisited with APL

Desktop publishing on the mainframe: integrating APL2 and Ventura Publisher

Implementing the recursive APL code for dynamic programming

Programming ecology or APL and the world at large

DEMOS—a PC-system for population projections for small areas

An insurance simulation model

Algorithm alterable models and APL

An array-theoretic look beyond APL2 and Nial

Multi-axis NC postprocessor for machining centers

Object oriented database using frames in second generation APL

Reading to write

IBM system/370 channel programming using APL

Managing a diamond jewelry manufacturing business using APL

A preferable look—APL in window-based environments

Toward a common prototyping language

Object-oriented programming of X Window System graphical user interfaces

A parallel APL machine

Writing applications for uniform operation on a mainframe or PC: a metric conversion program

Structured expert system design

Some uses of truncated Boolean vectors in analysis

What's ahead for 2000 A.D.?

Stability in a sea of change

A shading approach to non-convex clipping

LYYTI—integrated design and control system

APLELEGANCE—the art of staying within one's depth

FRESH, an expert system design tool on APL2

APL2OS: design considerations for a nested array file system

Design and implementation of the interface to compiled languages in APL*PLUS II

Very high quality user interfaces and fast data filing using a PC

Volume 20, Issue 3, March 1990

Volume 20, Issue 2, Dec. 1989

Volume 20, Issue 1, Sept. 1989

Object oriented programming, tutorial

Content Provider	ACM Digital Library
Author	Alfonseca, Manuel
Abstract	A classical procedural program (written in COBOL, FORTRAN, BASIC, PASCAL, LISP or APL2) is made of sentences that execute sequentially in a predefined order, that depends only on the values of the data the program is working with. This order can usually be deduced by visual inspection of the program.A non-procedural program (written in PROLOG, for instance) contains a certain number of instructions that will not be executed in a predefined order. They receive control from an inference processor, a procedural program that decides in every moment the order in which the sentences of the program should receive control (should be fired).In both the procedural and the non-procedural cases, the basic unit of execution is the program. The data only provide values that will be used to perform computations or to decide the order of execution. A given application is a hierarchical set of programs (modules) each of which is capable of invoking other programs in the hierarchy. The data may be global (accessible from every program in the hierarchy) or local (accessible by the program where they belong and, sometimes, by those at a lower level in the hierarchy).In Object-Oriented Programming (OOP in short), things are different. Here it is the data that are organized in a basic control hierarchy. One piece of data may be linked to another through a relation of descendancy, and this fact gives rise to a network (usually a tree) similar to the hierarchy of programs in procedural programming. There are also programs in OOP, but they are appendages to the data (in the same way as in classical programming data are appendages of programs). It is possible to build global programs (accessible to all the data in the hierarchy) and local programs (accessible from certain objects and their descendants).In OOP, the execution of a program is fired by means of a message that somebody (the user, another program or an object) sends to a given object. The recipient of the message decides which program should be executed (it may be a local program, or a global program which must be located through the network that defines the structure of the objects).There is a certain amount of confusion on what is Object-Oriented Programming and what is not. This has happened before, with other fields in Computer Science. There are still people, for instance, that call Artificial Intelligence to any program that is written in Prolog or Lisp. In the same way, there are those who maintain that any program written in Smalltalk, C++ or Objective C is OOP. As in the AI example, this is not always the case.Another source of confusion comes from the fact that Object-Oriented Programming has been frequently used to build complicated user interfaces, with window systems, icons and so forth, and this has produced the unexpected results that many people believe that any program including these interfaces is OOP. Again, this is obviously wrong.The basic elements of OOP are Objects, Methods and Messages.An Object is a complex data element that possesses structure and is a part of an organization. It embodies three different concepts:A set of relations to other objects (usually represented by pointers).A set of properties (which have values).A set of methods (defined by means of executable code).A method is a procedural program written in any language. What other programming systems call functions, programs or procedures, Object-Oriented Programming calls methods. There is no essential difference between programs in any language and methods, except for the fact that in pure OOP the CALL instruction is not allowed. The reason for this is obvious: the CALL instruction is
Starting Page	7
Ending Page	8
Page Count	2
File Format	PDF
ISSN	01636006
DOI	10.1145/97811.97817
Journal	ACM SIGAPL APL Quote Quad (APLQ)
Volume Number	20
Issue Number	4
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1988-12-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article

Central Library (ISO-9001:2015 Certified)
Indian Institute of Technology Kharagpur
Kharagpur, West Bengal, India | PIN - 721302

See location in the Map
03222 282435
Mail: support@ndl.gov.in

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in