Problem Palindromes
A regular palindrome is a string of numbers or letters that is the same
forward as backward. For example, the string "ABCDEDCBA" is a
palindrome because it is the same when the string is read from left to
right as when the string is read from right to left.
A mirrored string is a string for which when each of the elements of
the string is changed to its reverse (if it has a reverse) and the
string is read backwards the result is the same as the original string.
For example, the string "3AIAE" is a mirrored string because "A" and
"I" are their own reverses, and "3" and "E" are each others' reverses.
A mirrored palindrome is a string that meets the criteria of a regular
palindrome and the criteria of a mirrored string. The string "ATOYOTA"
is a mirrored palindrome because if the string is read backwards, the
string is the same as the original and because if each of the
characters is replaced by its reverse and the result is read backwards,
the result is the same as the original string. Of course, "A", "T",
"O", and "Y" are all their own reverses.
A list of all valid characters and their reverses is as follows.
Character Reverse Character Reverse Character Reverse
A A M M Y y
B N Z 5
C O O 1 1
D P 2 S
E 3 Q 3 E
F R 4
G S 5 Z
H H T T 6
I I U U 7
J L V V 8 8
K W W 9
L J X X
* Note that 0 (zero) and O (the letter) are considered the same
character and therefore ONLY the letter "O" is a valid character.
Input
Input consists of strings (one per line) each of which will consist of
one to twenty valid characters. There will be no invalid characters in
any of the strings. Your program should read to the end of file.
Output
For each input string, you should print the string starting in column 1
immediately followed by exactly one of the following strings.
STRING
CRITERIA
" -- is not a palindrome."
if the string is not a palindrome
and is not a mirrored string
" -- is a regular palindrome."
if the string is a palindrome and
is not a mirrored string
" -- is a mirrored string."
if the string is not a palindrome
and is a mirrored string
" -- is a mirrored palindrome."
if the string is a palindrome and
is a mirrored string
Note that the output line is to include the -'s and spacing exactly as
shown in the table above and demonstrated in the Sample Output below.
In addition, after each output line, you must print an empty line.
Sample Input
NOTAPALINDROME
ISAPALINILAPASI
A3MEA
ATOYOTA
Sample Output
NOTAPALINDROME -- is not a palindrome
ISAPALINILAPASI -- is a regular palindrome
2A3MEAS -- is a mirrored string
ATOYOTA -- is a mirrored palindrome
Sunday, June 21, 2009
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