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Implement the classic method for composing secret messages called a square code.
Given an English text, output the encoded version of that text.
First, the input is normalized: the spaces and punctuation are removed from the English text and the message is downcased.
Then, the normalized characters are broken into rows. These rows can be regarded as forming a rectangle when printed with intervening newlines.
For example, the sentence
If man was meant to stay on the ground, god would have given us roots.
is normalized to:
ifmanwasmeanttostayonthegroundgodwouldhavegivenusroots
The plaintext should be organized in to a rectangle. The size of the
rectangle (r x c
) should be decided by the length of the message,
such that c >= r
and c - r <= 1
, where c
is the number of columns
and r
is the number of rows.
Our normalized text is 54 characters long, dictating a rectangle with
c = 8
and r = 7
:
ifmanwas
meanttos
tayonthe
groundgo
dwouldha
vegivenu
sroots
The coded message is obtained by reading down the columns going left to right.
The message above is coded as:
imtgdvsfearwermayoogoanouuiontnnlvtwttddesaohghnsseoau
Output the encoded text in chunks that fill perfect rectangles (r X c)
,
with c
chunks of r
length, separated by spaces. For phrases that are
n
characters short of the perfect rectangle, pad each of the last n
chunks with a single trailing space.
imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn sseoau
Notice that were we to stack these, we could visually decode the cyphertext back in to the original message:
imtgdvs
fearwer
mayoogo
anouuio
ntnnlvt
wttddes
aohghn
sseoau
You can run all the tests for an exercise by entering
$ gradle test
in your terminal.
J Dalbey's Programming Practice problems http://users.csc.calpoly.edu/~jdalbey/103/Projects/ProgrammingPractice.html
It's possible to submit an incomplete solution so you can see how others have completed the exercise.