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Download e-book for kindle: Introduction to Computing by Percy Mett (auth.)

By Percy Mett (auth.)

ISBN-10: 0333393368

ISBN-13: 9780333393369

ISBN-10: 134908039X

ISBN-13: 9781349080397

ISBN-10: 1411431391

ISBN-13: 9781411431393

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It is also necessary to set out the dependencies between individual steps. Sometimes the steps form a logical sequence, in which a given step cannot be performed until certain data is available from one or more other steps; these other steps need to be executed prior to the given step. The order of execution of certain other steps may be immaterial and, if resources permit, it may be possible to allow execution of these steps to overlap, or to be performed in parallel. The computers now available commercially are all essentially sequential machines, that is, in general they are able to perform one action at a time.

This form of expressing program designs is called structured English or pseudocode. Program Control 25 Branch constructs A number of candidates sit an examination. They are to be graded into several categories of pass and fail according to their marks. Assuming that the names and marks of candidates are held on file, a top-level design for this process might be: 1 open candidate file 2 loop 3 obtain candidate data 4 allocate grade 5 until end of candidate file 6 close file In allocating the grade a suitable action must be selected.

On the other hand, the program statement should be intelligible to the human reader. This is necessary for two reasons. Firstly, it must be possible to check that the program meets the user's requirements. In addition, in any practical application, the problem will evolve over a period of time as conditions change. Thus programs inevitably have to be modified to meet the needs of a changing environment. This can be done only if the human programmer who implements the change understands the form and content of the program.

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Introduction to Computing by Percy Mett (auth.)

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