Programming Smalltalk – Object-Orientation from the by Johannes Brauer

By Johannes Brauer

An easy, step by step creation to transparent and stylish object-oriented programming. utilizing a language that's excellent for this type of programming, the e-book has been established in different classes and workshops over ten years.

Programming Smalltalk is especially fitted to readers without earlier programming wisdom. ranging from the 1st rules of programming, it teaches you the way to exploit and create algorithms (reusable principles for problem-solving) and the elemental development blocks of software program. It is going directly to clarify tips on how to increase entire purposes and has an entire bankruptcy on internet functions in addition to case studies.

Now translated into English, this version was once thoroughly revised to be in keeping with the newest model of Cincom® VisualWorks®, a certified Smalltalk surroundings. All examples have been created utilizing VisualWorks, that's to be had free of charge for academic reasons, and will be downloaded and put in on any updated laptop.

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Programming Smalltalk – Object-Orientation from the Beginning: An introduction to the principles of programming

An easy, step by step advent to transparent and chic object-oriented programming. utilizing a language that's ideal for this sort of programming, the booklet has been confirmed in several classes and workshops over ten years.

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Now translated into English, this variation used to be thoroughly revised to be in step with the newest model of Cincom® VisualWorks®, a certified Smalltalk setting. All examples have been created utilizing VisualWorks, that's on hand free of charge for academic reasons, and will be downloaded and put in on any updated laptop.

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Additional info for Programming Smalltalk – Object-Orientation from the Beginning: An introduction to the principles of programming

Example text

In order to use case-by-case analysis to automatically solve a problem, you must always be sure that the list of possible cases is complete. That means that, within a program, all cases of partial solutions that arise from the problem result in program steps that are tied to conditions. In the case where a = 0, the equation Q “degenerates” to a linear equation: bx + c = 0 It would appear that there is no problem in solving this equation. Taking into account the condition a = 0, we write: if a = 0 then x = -c/b In the case a ̸= 0, the following subcases must be distinguished, which analysis of the radicand (b2 − 4ac) yields: 3.

What happens, for example, if a = 0? We already made reference in the last section to the problem that arises when the radicand (the expression within the radical) might be negative. If we are going to use SmaViM to solve this general equation, that is, to be able automatically to solve for all values of a, b and c, then SmaViM must master the concept of case-by-case analysis, because the same formula cannot be used to solve for all values of the coefficients. In other words, SmaViM must be able to make the execution of program steps dependent on conditions.

Each message in a class definition has a method available; that is, for each message selector that the objects of a class understand, there is a method, whose name agrees with that of the message selector. The list of all methods within a class is also referred to as the class’s method protocol. It is entirely possible that objects of different classes might accept the same message selector, but still execute unique methods. 3 But there are also messages that Strings can understand that whole numbers cannot.

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