Object-Oriented Programming in the Beta Programming Language by Ole Lehrmann Madsen, Birger Moller-Pedersen, Kristen Nygaard

By Ole Lehrmann Madsen, Birger Moller-Pedersen, Kristen Nygaard

Object-oriented programming originated with the Simula language built through Kristen Nygaard in Oslo within the Nineteen Sixties. Now, from the birthplace of OOP, comes the hot BETA programming language, for which this publication is either instructional and reference. It presents a transparent advent to the fundamental recommendations of OOP and to extra complex themes.

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4. An address should consist of street, street number, city, zip code and country. (3) Define patterns representing a point, line, segment, polygon, rectangle, square and rhombus. A segment is a list of lines where the end point of one line is the starting point of the next line. It should be possible to create objects of these patterns, move the objects, change one of the coordinates of a point, change the start (or end) point of a line, change the start (or end) point of a line in a segment or polygon, add a new line to a segment, and add a segment to a segment (consider what this could mean).

The names account1, account2 and account3 may all be used like myAccount. balance . The distinction between describing a singular object such as myAccount and describing a pattern representing a concept like Account is important. In the former, one is dealing with a situation where there is only one single object to consider. In the latter, there is a whole class of similar objects which may naturally be classified using a concept. From a technical point of view, it is convenient to avoid inventing a pattern name when there is only a singular object.

Range]. 1 illustrates the use of a repetition of static references. A repetition of integers has been added to the Account pattern. The repetition transactions keeps track of the sequence of transactions that have been made on the account. When 50 transactions have been made,1 a statement of the transactions is sent to the customer (only indicated by a comment), the repetition is cleared, and the recording of transactions is begun again. A repetition may also consist of dynamic references: A: [eval] ˆP Here each element in the repetition is a dynamic reference.

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