Your manager has recently purchased a machine that assists in reading letters and faxes sent in by branch offices. The machine scans the paper documents, and produces a file with a number of entries. You will write a program to parse this file.
The following format is created by the machine:
_ _ _ _ _ _ _
| _| _||_||_ |_ ||_||_|
||_ _| | _||_| ||_| _|
Each entry is 4 lines long, and each line has 27 characters. The first 3 lines of each entry contain an account number written using pipes and underscores, and the fourth line is blank.
Each account number should have 9 digits, all of which should be in the range 0-9. A normal file contains around 500 entries.
Write a program that can take this file and parse it into actual account numbers.
Simply call lein run on the sample file provided.
$ lein run examples1.txt
You find the machine sometimes goes wrong while scanning. You will need to validate that the numbers are valid account numbers using a checksum. This can be calculated as follows:
account number: 3 4 5 8 8 2 8 6 5
position names: d9 d8 d7 d6 d5 d4 d3 d2 d1
checksum calculation:
((1*d1) + (2*d2) + (3*d3) + ... + (9*d9)) mod 11 == 0
Your boss is keen to see your results. He asks you to write out a file of your findings, one for each input file, in this format:
457508000
664371495 ERR
86110??36 ILL
The output file has one account number per row. If some characters are illegible, they are replaced by a ?. In the case of a wrong checksum, or illegible number, this is noted in a second column indicating status.
Simply call lein run on the sample file provided, and specify an
output file.
$ lein run examples3.txt out3.txt
Copyright © 2015 Edward Cho
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.