A-LevelComputer ScienceProgramming9618/31 · Oct/Nov 2023 · Q88 Marks
A pseudocode algorithm finds a customer account record in a random file and outputs it. The records are stored using the user-defined data type TAccount. TYPE TAccount DECLARE AccountNumber : INTEGER DECLARE LastName : STRING DECLARE FirstName : STRING DECLARE Address : STRING DECLARE ContactNumber : STRING ENDTYPE
- (a)Complete the file handling pseudocode. The function Hash() takes the customer account number as a parameter, calculates and returns the hash value. DECLARE Customer : TAccount DECLARE Location : INTEGER DECLARE AccountFile : STRING - "AccountRecords.dat" AccountFile OUTPUT "Please enter an account number" INPUT Customer.AccountNumber Location ← Hash ( .) SEEK , Location AccountFile, OUTPUT Customer // output customer record CLOSEFILE AccountFile[5]
- (b)Define the term exception handling.[1]
- (c)State two possible causes of an exception.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- [1] One mark for each correctly completed line (Max 5)
- [1] One mark for correct definition (Exception handling is the process of) responding to an unexpected event when the program is running so it does not halt unexpectedly
- [1] One mark per mark point (Max 2), for example: Programming errors
- [1] User errors
- [1] Hardware failure
- [1] Runtime errors
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