Simula Where would we be without it? Historic Fun-facts Ole-Johan - - PowerPoint PPT Presentation

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Oct 18, 2023 463 likes •540 views

Simula Where would we be without it? Historic Fun-facts Ole-Johan Dahl and Kristen Nygaard SIMULA I (released 1965) Simula 67 (released 1967) Origins of Object-Oriented Programming Simu-what-now? No tool to simulate and

SLIDE 1

Simula

Where would we be without it?

SLIDE 2

Historic Fun-facts

 Ole-Johan Dahl and Kristen Nygaard  SIMULA I (released 1965)  Simula 67 (released 1967)  Origins of Object-Oriented Programming

SLIDE 3

Simu-what-now?

 No tool to simulate and describe complex

systems

 Stack mechanism  in Algol etc.  Queue system more suited for simulation  SIMULA I was written as an independent

Algol based language

SLIDE 4

Still not good enough

 Feature extension, resulting in a general-

purpose language

 Redesigned traditional subprograms  Coroutines allow the subprogram to

restart where it had previously stopped.

 Class construct to do coroutines

SLIDE 5

Classes, good idea

 Conceptualized and implemented for

Simula 67

 Inheritance  Encapsulation  Data abstraction  Virtual procedures

SLIDE 6

Told you so!

 Impact on the industry  Smalltalk (1970s)  C++ (1980s)  Java, Ada, Prolog, C#, any OOL  Text vs. String