A Structured Programming Approach to Data by Derek Coleman (auth.) PDF

By Derek Coleman (auth.)

ISBN-10: 0333219430

ISBN-13: 9780333219430

ISBN-10: 1349159816

ISBN-13: 9781349159819

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Sample text

Each time we develop a level of abstraction which corresponds to a given problem we are, in effect, refining the statement of that problem into one with more detail and more indication as to how the problem is to be solved. Each step in the refinement, P 1 , P 2 , P 3 , P 11 , . . , implies some design decisions which must be carefully considered from two different viewpoints. (I) Correctness - do correct solutions to P 1 , P2 , P 3 , always constitute a solution to P? (2) Feasibility - are solutions to P 1 , P2 , P 3 feasible bearing in mind the language or computer to be used?

Code; getstock := next; end lastcode : codenumber stockfilerror : integer are global variables. The analogous function gettransaction has a similar structure although it should also check the ordering of the transaction dates. code = thiscode do begin {sequence of same code records} printtransaction (t, error); t == gettransaction; end; end else {s. code = thiscode do begin {sequence of samecode records} news ==update (news, t); printtransaction:(t, ok); t == gettransaction; end; printtotal (news); put (news, NS); s == getstock end; end; end; The correctness of this program follows from its direct relationship with the program at the higher level.

There is no need to terminate execution on the oc•;urrence of a sequence error, they need only be reported in a manner analogous to the reporting of syntax errors by a compiler. The procedures getstock and gettransaction in the next level of refinement perform the task of sequence checking. Having convinced ourselves of the correctness of the solution so far we must continue the process of making it more concrete. The program can now be developed to handle the full transaction file structure in which there could be more than one transaction with the same code.

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A Structured Programming Approach to Data by Derek Coleman (auth.)


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