By Derek Coleman (auth.)
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Extra resources for A Structured Programming Approach to Data
9999; description : array [1 .. 20] of char; thedate : record theyear : 0 .. 99; themonth: 1 .. 12; theday : 1 .. 31 end; : 0 .. 999999 orderval end Notice that in this example and generally we may use any simple structured type as record components. imagpart assigns the imagpart of x to the realpart of y. For obvious reasons this method of denoting record type components is known as the 'dot-notation'. In some situations it can be tedious to quote the full Simple Data Structuring 29 name of each record component, so we may abbreviate it by use of with.
If the values can fit into less storage than one word, then it is possible to pack more than one component into the word. In a tightly packed representation, the bit patterns of the components are directly juxtaposed. In a more loosely packed representation, the components may be fitted within certain subdivisions of a word, which are 'natural' in the sense that special machine instructions are available for selecting or updating particular parts of a word - for example, half word,, byte or characters.
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.