By Derek Coleman (auth.)
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Additional resources for A Structured Programming Approach to Data
An input text consists of one or more words, separated from each other by one or more spaces and terminated by zero or more spaces followed by a point. With the character valued function RNC (Read Next Character) the input text should be read from and including the first letter of the first word up to and including the terminating point. An output text has to be produced, using the primitive PNC(x) (Print Next Character) with a char<1cter valued parameter, with the following properties (a) successive words have to be separated by a single space (b) the last word has to be followed by a single point (c) when we number the words 0, 1, 2, 3, ...
Decomposition. The discovery of an error during the design process should be considered neither as a random mistake to be fixed and forgotten as soon as possible, nor as a wrongdoing to be subjected to a cover-up by bending the problem specification. 1 (1) the true nature and extent of the error (2) the misconceptions or unfounded assumptions that led to the error. Once the true nature of the error is understood, the designer must 'back up' the development tree and redo the refmement process from the first error-free level.
Given a problem P, we try to discover a set of smaller problemsP1 ,P2 ,P3 , . . , such that solving firstP 1 , thenP2 and so on will be a solution to the original P. This approach is then applied to each of the subproblems P 1 , P 2 , P 3 , • .. , producing a set of sub-subproblems whose solutions taken together are a solution to P 1 • We continue this process until the problems are sufficiently small to be capable of solution directly. It is the continual outside-in analysis of the problem which develops the solution to the problem.