Object-Oriented Programming in Oberon-2 by Hanspeter Mössenböck

By Hanspeter Mössenböck

No doubt the belief of object-oriented programming has introduced a few movement into the sector of programming technique and enlarged the set of programming languages. Object-oriented programming is not anything new-it first arose within the sixties. the incentive got here from the simulation of discrete occasion platforms. the concept that first manifested itself within the language Simula sixty seven. It took approximately 20 years for the tactic to achieve impetus, and this present day object-oriented programming is a crucial idea and a strong approach. in the meantime, we will even communicate of an over­ response, for the idea that has turn into a buzzword. yet buzzwords continuously look the place there's the wish of exploiting ill-informed consumers simply because they see the hot strategy because the method to all their difficulties. hence object-oriented programming is frequently hailed as a panacea. And so the query is justified: what's rather in the back of it? To enable the cat out of the bag: there's extra to object-oriented programming than in simple terms placing information as gadgets within the fore­ flooring, rather than algorithms to which the knowledge are topic. it's greater than only another view of programmed platforms. to spot the essence of object-oriented programming, is the topic of this e-book. this can be a textbook that indicates in a didactically skillful method which techniques and constructs are new, the place they are often hired quite, and what merits they give. For, now not all courses are instantly more suitable via only recasting them in an object-oriented variety.

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The value that a function procedure is to return must be specified in a return statement. A function procedure is characterized by the declaration of a result type following its formal parameter list. Procedures can invoke themselves recursively. With each invocation, a new set of local variables is allocated, so that every invocation of the procedure works with its own local variables. A number of standard procedures such as ORD, CHR, LEN and COPY are predeclared. 3. 6 Modules Large programs are normally decomposed into smaller units, called modules.

This means that Oberon-2 does not permit cyclic import relationships among modules. The initialization sequence would otherwise be undefined. A variable or a record field can be exported as read-only so that clients can read its data, but they cannot make modifications. This increases the reliability of the system, because the exporting module can be sure that clients will not destroy its data. Read-only variables and fields are marked with a minus sign (-) instead of an asterisk (*) in their declaration.

It overrides the scope of any identically named identifier declared in an outer block. The scope of the parameter i in Hex overrides the scope of the variable i in IntToHex. Nested scopes allow the declaration of arbitrary identifiers in every procedure without having to bother about whether an identifier was already declared outside the procedure. Good programming style suggests that a procedure work only with its own local variables (including its parameters) and that it not use global variables or-even worse-local variables of an enclosing procedure.

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