By Derek Coleman (auth.)

ISBN-10: 0333219430

ISBN-13: 9780333219430

ISBN-10: 1349159816

ISBN-13: 9781349159819

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There is no need to terminate execution on the oc•;urrence of a sequence error, they need only be reported in a manner analogous to the reporting of syntax errors by a compiler. The procedures getstock and gettransaction in the next level of refinement perform the task of sequence checking. Having convinced ourselves of the correctness of the solution so far we must continue the process of making it more concrete. The program can now be developed to handle the full transaction file structure in which there could be more than one transaction with the same code.

6 A bank wishes to produce a summary of the transactions made on each account during an accounting period. For each account the bank wants a list showing the balance at the beginning of the period, the number of deposits and withdrawals made, and the final balance. Each accounts file record contains the account number and the account balance at the beginning of the period. The accounts file is sorted in ascending order of account number. Each transaction file record contains the account number, the transaction type (deposit or withdrawal) and the transaction amount.

3 IMPLEMENTATION OF ARRAYS The implementation of one-dimensional arrays in store is familiar to most programmers. The usual implementation allocates one or more whole words to each element of the array. The memory address of each element is easily computed: first, the value of the subscript is converted to its integer representation; then this is multiplied by the number of words occupied by each element; and finally the result is added to the address of the first element of the array. The normal addressing mechanism of the computer can be used to access and update this value independently of the other elements of the array.

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


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