Download e-book for iPad: A Structured Programming Approach to Data by Derek Coleman (auth.)

By Derek Coleman (auth.)

ISBN-10: 0333219430

ISBN-13: 9780333219430

ISBN-10: 1349159816

ISBN-13: 9781349159819

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Extra resources for A Structured Programming Approach to Data

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Conscious understanding of the causes of the error is an essential element in the experience that differentiates the skilled programmer from the inexpert. Program design involving as it does the 'unmastered complexity' of an infinite set is very prone to human error. No reasonable safeguard should be omitted by the designer to ensure that he keeps to a minimum the number and scope of the errors he 'designs'. The temptation to distort program structure in the name of efficiency should be restricted during the design process.

4 VARIANT TYPES In defining structured types it is often useful to be able to form a type from the union of two types. For instance in a stock control application we may have different types of update records depending on the nature of the transaction. The set of values constituting the type update will be the uniont of all the different transaction types. t The union U V of two set sets, U, V is defined as {xiX is in U or X is in V} A Structured Programming Approach to Data 32 Suppose we can distinguish three types of transaction =record :integer; stock no :date; dated quantity : integer; purchaser code : 0 ..

The usual representation of a subrange is obtained by giving each value the same representation that it had in the original type. A check should be made to ensure that the value is within the specified range. When implementing a type it is necessary to decide on an initial preset value of every variable on declaration. In the absence of any guidance from the problem area, the zero or null value should be chosen. 7SUMMARY 1. An abstract programming language is a notation for expressing program design.

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

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