By Ole Lehrmann Madsen, Birger Moller-Pedersen, Kristen Nygaard
Object-oriented programming originated with the Simula language built by means of Kristen Nygaard in Oslo within the Sixties. Now, from the birthplace of OOP, comes the hot BETA programming language, for which this e-book is either instructional and reference. It presents a transparent creation to the elemental suggestions of OOP and to extra complicated subject matters.
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Extra resources for Object-Oriented Programming in the Beta Programming Language
The other attributes may be denoted in a similar way. The myAccount object is called a singular object, since the object descriptor (# ... #) is only used for describing a single object. Patterns In a banking system there is clearly a need to represent several bank accounts, thus the system includes a pattern representing the concept of a bank account. The objects representing the actual bank accounts may then be described as instances of this pattern. The pattern representing the concept of a bank account may be described as follows: Account: (# balance: ...
Consider the following declaration of three integerobjects: I,J,K: @integer The standard infix notation for integer expressions can be used: 1+I->I; (I*J)+12->K In principle, it corresponds to the following evaluation using function calls: (1,I)->+->I; ((I,J)->*,12)->+->K It is, however, not possible to use the above function call syntax. Only the infix notation can be used. 3 PATTERN ATTRIBUTES 43 For the real pattern, the arithmetic operations +, -, * and / are defined. For the boolean pattern, the functional patterns and, or and not are defined.
The possible kinds of attributes are further described below. ✁ In is a description of the enter-part of the object. The enter-part is a list of input parameters which may be entered prior to execution of the object. ✁ Imp is the do-part of the object. The do-part is an imperative that describes the actions to be performed when the object is executed. An object may, for instance, be executed as a procedure, a coroutine, or as a concurrent process. In Chapters 13–15, the use of objects as coroutines and concurrent processes is described.