Compare the following versions of the ``summation'' program:
- The original version as written.
- The original version with ``2'' used in place of ``2.0''.
- The original version with the terms summed in the opposite order.
- The original version with sum declared to be a double instead
of a float.
- The Maple version.
Use each of these programs to compute the sum for n = one million.
Carefully explain why the differences in the answers arise. Which one do you
think is correct? Why?