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

By Derek Coleman (auth.)

ISBN-10: 0333219430

ISBN-13: 9780333219430

ISBN-10: 1349159816

ISBN-13: 9781349159819

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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.

Using this notation Algol declarations such as integer squareof [1 : 100] real array x[4: 15] boolean array z[2: 10] are written as squareof: array [1 .. 100] ofinteger x: array [4 .. 15] of real z: array [2 .. 10] of boolean The declaration of an array fixes the domain and range types and the array size;t the size of an array is constant throughout its lifetime. The declaration does not specify the function itself, in fact since array elements may be updated the function being represented may change during the lifetime of the array.

Theday == 25 2. Records are implemented by juxtaposing the components in store, in either a packed or unpacked format. 3. Variant types are records which have components that may assume different structures according a tag field, for example type partmovement =record part no : integer; quantity : integer; dated : date; case direction: (in,out) of in : (supplier: array [1 .. direction of in : increase stock process; out : reduce stock process end 4. Variant types require the explicit implementation of tag fields.

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


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