By Derek Coleman (auth.)
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Additional info for A Structured Programming Approach to Data
In order from left to right, the words with an even ordinal number have to be copied, while the letters of the words with an odd ordinal number have to be printed in reverse order. ' Design and implement a program for this problem. 1 INTRODUCTION So far we have only considered the simple data structuring operations of forming records with or without variants. Although these operations are adequate for many problems they are, by themselves, incapable of expressing clearly the full range of abstractions that can occur in programming.
OS, NS, T and R denote the set of stock codes on the old stock file, new stock me, transaction me, and report file respectively. The input to the program is simply the union, S U T. The desired output can be specified as for all x inS U T (a) x inS, and x in T then put updated (x) inNS and put x in R (b) x inS, but x not in Tthen put x inNS andR (c) x not inS, but x in T, then put x in R and mark as error. This can be achieved by a simple and highly abstract program begin x ==get (S U T); while more in S U T do begin if x not in T then begin putx inNS; putx inR end On Program Design 43 else if x not inS then put x in R and mark as error else begin put updated (x) inNS; putx inR end; x := get(S U T) end; end This 'program' is clearly correct, since it processes all x inS U T and deals with all the cases mentioned in the abstract specification.
Though the idea of avoiding the use of gotos was fairly well known by the mid 60s (for example, Landin, 1966). Peterson et al. (1973) show that gotos can be eliminated without loss of generality. The December 1974 issue of Computing Surveys was devoted to structured programming and includes an excellent article on the use of gotos in structured programming by Knuth (1974), as well as Wirth (1974). 1 ARRAY STRUCTURES Array structures are the most common form of data structure and are familiar to most programmers.
A Structured Programming Approach to Data by Derek Coleman (auth.)