From your work on previous projects, you now have a generic table handler package Tables_Generic_List that uses linked lists to represent the tables. In this project you will use this package with a completely different kind of client.

Requirements

The ESF has hired you to prepare a program to process the results of its Presidential election. The main Presidential candidates are Groucho and Harpo; there are two minor candidates, Chico and Zeppo. The candidate with the most votes wins. There is no electoral college. (Things are bad enough as it is, in Fredonia!)

ESF officials want you to develop an external database consisting of one file for each state, and an internal one consisting of one table for each state. (Each state table will thus have up to five nodes, one for each of its counties.) Each day, an external file of voting reports is processed and the database is updated.

Here is an example voting report from a given county:

Confusion, County3, 20, 300, 0, 5

where the numbers represent the votes for Groucho, Harpo, Chico, and Zeppo, in that order. The election reporting is a bit disorganized and recounts are common, so the numbers keep changing and a given county can thus send many reports.

Furthermore, the ESF officials are afraid of anything related to television (including computer monitors), so your contract requires a batch program. Each time this program is run, it does the following steps:

1. Restore the internal database from the external files
2. Read the latest set of voting reports from the file, processing each report as it is read.
3. If a report is the first one from a given county, it is added to the appropriate table. If this county is already in the table for that state, the new report replaces the old one.
4. Write a summary of the results into a file. The results will show the vote totals for each candidate in each state, and the overall national totals for each candidate.
5. Save the internal database back into its three files.

Implementation

• Suppose your client program contains a table package instance ElectionTables. In this client program, instead of declaring one table variable, just declare

TYPE ElectionDatabase IS ARRAY(Fredonia.States) OF ElectionTables.TableType;
Election: ElectionDatabase;

Given a category OneState, then Election(OneState) selects the appropriate table. Naturally you can loop through all the tables easily: FOR WhichState IN Fredonia.States LOOP, etc.

• The client program must deal with the multiple tables. For example, your client will carry out an insertion operation by determining the state of the new record, then calling ElectionTables.Insert with the appropriate table parameter.
• This client will contain no deletions, only insertions and replacements.

Call the 3 state files confusion.dat, glory.dat, and grace.dat. You are to run the client program 4 times to simulate 4 days' processing. After each run, cat the contents of the 3 state files and the results file into your turnin.