When the ECB system starts up, it assumes that an electronic phone book has the contact information as given in the phone book file, and it manages the contact records according to the instructions in the instruction file. • • Phone book file contains contact information in a predefined format; Instruction file lists instructions/commands to be performed on the records. The instructions/commands can be: “add”, “delete”, “query”, and “save”.
add name Jo Bloggs; birthday 08-07-1980; phone 88884444; address 9001 Chester Crescent is supposed to add/update a record for a person with name "Jo Bloggs", birthday 8/7/1980, phone number 88884444 and address "9001 Chester Crescent". Your ECB system checks whether this is an existing record: • • if both person name and birthday are identical to those of an existing record in your phone book, the existing record will be updated with the new input information. E.g., update the items of address, email, and phone. otherwise your system adds the new valid record to the list.
For instance, the instruction delete Jeff Vader indicates deleting the record(s) with name “Jeff Vader” from the list. delete Jeff Vader ; 8-07-1980 indicates deleting the record with name “Jeff Vader” and birthday “08/07/1980” from the list.
For instance, query birthday 8-09-1991 query name David Joans o query phone 9110110 NOTE: If there are more than one query results, all the query results should be saved in ascending order of person name and birthday.
Save the resulting data collection of the instructions of “add” and “delete” into the specified output file Save the query results to a separate specified report file. When there are more than one “query” command, append the latest query results to the end of the report file. Separate the results of different query instructions using dash lines with query instructions.