During lab today you will begin writing the solutions for these problems:
1.
Write a version of a palindrome recogniser that accepts a file name from
the user, reads each line, and prints the line to the screen if it is a
palindrome.
2.
According to Wikipedia, a *semordnilap* is a word or phrase that spells
a *different* word or phrase backwards. ("Semordnilap" is itself
"palindromes" spelled backwards.) Write a semordnilap recogniser that
accepts a file name (pointing to a list of words) from the user and finds
and prints all pairs of words that are semordnilaps to the screen. For
example, if "stressed" and "desserts" is part of the word list, the the
output should include the pair "stressed desserts". Note, by the way, that
each pair by itself forms a palindrome!
3.
Write a *procedure* char_freq_table() that, when run in a terminal,
accepts a file name from the user, builds a frequency listing of the
characters contained in the file, and prints a sorted and nicely formatted
character frequency table to the screen.
You start today and continue at home. They will count as problems a8p1,
a8p2, a8p3 of lab 8. They will be graded next week. Next week you will also
work on problems a8p4, a8p5, a8p6.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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