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By Philip Barker (auth.)

ISBN-10: 0333425405

ISBN-13: 9780333425404

ISBN-10: 1349185191

ISBN-13: 9781349185191

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N slides from current position, initialise a projector (set at slide 0), switch any projector on/ off at any given time, and perform any of the above operations simultaneously on a specified subset of the array of projectors. Discuss the author language and the program generator approaches to providing the above facilities. 1 Introduction In the previous chapter the word 'courseware' was introduced as an umbrella term to describe the many different types of instructional software that are likely to be employed in a computer-based teaching situation.

The AECAL authOring system is described in more detail in chapter 4. AGRAPH This is a graphic support system that can be used to generate material for use in a CAL environment (Read, 1985). AGRAPH is a data-fIle orientated easy-tolearn and easy-to-use graphics package that can plot a variety of different types of graph using a wide range of display devices. From suitably prepared data fIles AGRAPH can produce x-y plots, 3-D wire figures, 3-D volume density figures, 3-D hidden line figures, and contour/streamline field maps.

12 The function of a language translator The types of data item and the relationships between them are described in terms of entities known as data structures. Together, algorithms and data structures represent a problem solution that must now be expressed in a form that the computer can 'understand'. That is, they must be coded into a computer program using either a high-level or a low-level programming language. Such a program representation can then be translated automatically into its operational form by means of a language translator.

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Author Languages for CAL by Philip Barker (auth.)

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