Currently Ledger-CLI uses floating point arithmetic, which is definitely a

   mistake for an accounting system.  This causes

   [off-by-one bugs](http://bugs.ledger-cli.org/show_bug.cgi?id=992) on some

   types of transactions.  This should be fixed.

   A successful student on this task will:

      * Write various test cases for Ledger-CLI that will clearly show the

        floating point issue.

      * Rework the codebase to use fixed-point arithmetic so those bugs are

        closed.

      * Shepherd the patch upstream.

      * Time permitting: verify that other Ledger implementations don't

        face the same problem.

3. Build a better test suite for [Ledger-CLI](http://www.ledger-cli.org/).

   Since this project relies so heavily on Ledger-CLI, we'd really like there

   to be a full test coverage for Ledger-CLI.  To do that, a student will

   need to be already somewhat familiar C++ and willing to learn about how to

   set up test suites for C++ programs, and likes writing tests.  The student

   could easily spend the whole summer just writing tests and not finish.

    Ledger-CLI does have a basic test suite, but it might turn out that using

    a more "full featured" test harness is useful.  The student will

    investigate and discuss this possibility with the mentor.  It would also

    be nice if lcov or other test-coverage tool could generate reports