Download Ada Software Tools Interfaces: Workshop, Bath, July 13–15, by Peter J. L. Wallis PDF

By Peter J. L. Wallis

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Extra resources for Ada Software Tools Interfaces: Workshop, Bath, July 13–15, 1983 Proceedings

Sample text

In this book we limit ourselves to only two types of values: either integers or Boolean values “true” and “false” denoted by true and false, respectively. Considering other types of values, like real numbers, would not add value to this book. 1 Using indexed variables as indices, also known as indirect indexing, introduces an additional level of difficulty in reasoning about programs, very much like pointer aliasing in the C language, for instance. As an example consider the following pathological case due to Dijkstra.

This example shows that contrasting instances is important to precisely understand the dynamic behavior of a program and that being able to name these instances is also a must. Indeed, we intuitively feel the notations above are awkward. We have to find better ones! 9 Parameters Using English words like “first” and “second” is not the reason why the above notations are awkward. Using numbers is only a tiny step forward: Indeed, writing RD(310 ) = {39 } is not much clearer. More importantly, we still have to enumerate all possible cases, that is, to state that RD(39 ) = {38 }, that RD(38 ) = {37 }, and so on.

Notice also that there are several ways to give names to execution traces. In the trace names above, explicitly mentioning statement 5 doesn’t add any information because we have to go through this statement anyway. The same holds with statement 3 (which is not even an actual statement, but the beginning of the second part of the if statement). Indeed, we can talk without ambiguity about traces 12 and 14. Considering possible executions has a very strong impact on analyses explored in this book.

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