Read e-book online Software Engineering in Modula-2: An Object-Oriented PDF

By Jill A. Hewitt, Raymond J. Frank

ISBN-10: 0333515188

ISBN-13: 9780333515181

ISBN-10: 1349112607

ISBN-13: 9781349112609

This booklet introduces Modula-2 via an object-oriented programming method which has been built during the last 5 years at the BSc and MSc desktop technological know-how classes at Hatfield. bankruptcy 1 introduces the most positive aspects of Modula-2 via an instance application, while bankruptcy 2 introduces the ideas required for object-oriented application layout. the entire crucial excessive point good points of the language are lined in a few element in chapters three to eight. bankruptcy nine explores the most attributes of an object-oriented language and considers to what quantity those positive aspects are represented in Modula-2. Chapters 10-12 increase object-oriented way to easy instance in the course of the implementation of a few of those positive factors. The low point beneficial properties of the language are mentioned in bankruptcy thirteen, and bankruptcy 14 extends those beneficial properties to debate the implementation of easy working method services in Modula-2. This ebook is suitble for newbies in programming following an undergraduates in desktop technological know-how and as self-study textual content for more matured high-level language programmers who desire to examine Modula-2 within the context of an object-oriented technique. we suggest learn and enforce the instance software in bankruptcy 1 then learn bankruptcy 2 to procure a flavour of item orientated layout; even though they need to go away an entire learn of the instance application in bankruptcy 2 till they've got turn into totally accustomed to the fabric in chapters three to eight. The more matured programmer would possibly not have to implemten this system in bankruptcy 1 yet should still rigorously examine the instance in bankruptcy 2 the place a contrast among extra conventional useful decomposition and the object-oriented method is explored in a few aspect.

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A real number input to a program must always contain the decimal point, and it may be in natural or scientific format. The following are all ways of representing the same number: 500. 0E2 Simple Data Types and Expressions 37 The operators which yield a real result are: * I + multiply divide add subtract Operator precedence is: first ( *, 1), second (+,-). Mixed expressions are not allowed, but a type conversion may be accomplished via the pre-defined function: TRUNC(r) which yields the cardinal equivalent of a real number by chopping off the decimal part.

LOOP Sometimes the logic of an algorithm dictates that the exit from a loop structure should be in the middle rather than at the beginning (WHILE) or at the end (REPEAT). The LOOP construct is provided to fulfil this need. It may also be used to define a non-terminating process in a concurrent system. The general form of the LOOP statement is: LOOP END If the loop is to terminate, then one or more of the statements must contain the EXIT command which causes termination of the LOOP and passes control to the next statement after the LOOP end.

If the real number is negative, the sign is ignored. The standard library module MathlibO will usually provide a function entier which yields the integer equivalent of a positive or negative real number. 2 illustrates the use of a real number in calculating the mean of two cardinals. 0 not 2 because the expression is to yield a real result. 4. 2 - Program to Calculate a Mean MODULE Mean; (*calculates the mean of two cardinals input by the user and outputs it as a formatted real number. 0; END (*OUTPUT THE RESULT*) WriteString("The mean is: >"); WriteReal(average,B); Mean.

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Software Engineering in Modula-2: An Object-Oriented Approach by Jill A. Hewitt, Raymond J. Frank


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