A Flash Card System in C++.

This tool manages the making, testing, editting of
simple flash cards.
A flash card has a question string and an answer string.
User can check whether he remembers the answer corresponding
to the question; question appears, user checks himself whether
he remembers it, and press 'ENTER', and see the answer, and
user can tell this program whether he successfully answered or not.
The more a user answers a card correct consecutively, the less the card
will appear on the test.


sources:
  card.hh: defines class Card. represents a card.
  cardlist.hh: defines class Cardlist. represents a card list.
  command_tango.cpp : commandline implementation of card system.



how to build:
   aclocal
   autoheader
   autoconf
   ./configure # on mac, append CXXFLAGS=-stdlib=libc++
   make



synopsis:
  path-to-tango <archive file> [<archive file> ...]


top level loop:
  * 'i'   : info about cards
  * 'l'   : list all the cards
  * 'm'   : make card
  * 'q'   : quit current archive
  * 'qa'  : quit the program
  * 's'   : search cards;
            search done by matching substring of question
  * 'sm'  : search or make.
    	    tries to make a card if query not found
  * 'sa'  : search cards by matching Q and A
  * 't'   : test cards
  * 'w'   : save cards to the archive file
  * 'wq'  : save and quit the archive
  * 'wqa' : save the archive, quit the program

on test loop:
  * 'e'   : edit the testing card
  * 'i'   : info about the testing card
  * 'n'   : tell program that you failed to answer correctly
  * 'q'   : quit the testing cards
  * 's'   : skip this card
  * 'x'   : delete this card
  * 'y'   : tell program that you answered correctly


About editting:
  * Enter nothing to specify "Do not change"
  * Enter '+' at beginning to specify "append"