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By Trinder P.

ISBN-10: 0902928619

ISBN-13: 9780902928619

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Extra resources for A functional database

Sample text

To recapitulate, a global variable is one that is identified with, that is, uses the storage container of, another variable with the same name occurring at a higher level of the program (such as a calling environment), while a local variable has its own local storage container. Locals are not identi­ fied with any higher-level variables. The use of global variables gives rise to the sharing of information among the procedure components of a program. In this chapter we examine other means of interfacing procedures, that is, other means of transmitting or sharing information among related procedures.

In the environment of One_character, U and V are both global variables referring to the storage cells created in the MPL environment. This is all very well and in agreement with the ideas so far developed. How­ ever, now suppose we want to print two chessboards: not only the chessboard as shown in Figure 1-2 but also that shown in Figure 2-3, that is, with "-" for the scope of the Queen and " * " for the positions outside the scope, instead of vice versa. At present this second output can be accomplished in the following unsatis­ factory way.

Many of the concepts we want to develop can be illustrated using the exam­ ple problem of printing a chessboard. Before starting our discussion however, let us consider a recomposition of the Figure 1 - 1 8 algorithm showing fewer 56 2-1 INTRODUCTION steps of decomposition and hence fewer procedures. Such a version, Figure 2-1, while perhaps less understandable than the more fully decomposed version of Figure 1 - 1 8, will prove more convenient for the purposes of diagramming many of the ideas we want to develop in this chapter.

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A functional database by Trinder P.


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