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

By Derek Coleman (auth.)

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N-dimensional arrays may be used to represent values in a discrete n-dimensional space. In particular two-dimensional arrays are frequently used to represent information which needs to be manipulated or output in tabular form, for example, stock-level reports, mathematical tables, or boards in game-playing programs. An array of n dimensions may be regarded as a one-dimensional array of elements which are arrays of n- 1 dimensions, for example, the twodimensional array a= {a;jli= 1, w, ... ,m andj= 1, 2, ...

B) Transaction File The transaction records have the following structure On Program Design Field Type Stock code number Date Quantity Transaction type (c) (1) (2) (3) (d) 41 codenumber date type 0 .. 10000 (sale, loss, purchase, return, gain) The records that have been validated are sorted in ascending sequence of date within stock code number. Report Fonnat Heading Each page of the report carries a heading, where n is the page number 'STOCK REPORT PAGE n' Stock Information Information is printed about each type of stock in order of ascending stock code number and consists of the product name, a list of all transactions on this run for this stock code number in date order, followed by the total change in stock level, value of stock in hand (based on cost price) and profit for this run.

4SUMMARY 1. An array is a ftxed size, finite, set of elements, each element is of the same type and may be individually referenced by the use of subscripts. 2. Arrays are a structured or static representation of functions. 3. Arrays may either be implemented by (a) the runtime evaluation of the mapping function (b) the explicit storage of the mapping function as a tree structure. 5 BIBLIOGRAPHICAL NOTES The implementation of arrays is discussed in many books on programming. Well worth reading is the section on arrays in chapter 2 of Knuth's classic book The Art of Computer Programming, vol.

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