You are permitted, and encouraged, to work together on these problems,
provided that every contributor understands how the complete solution
was found. Put the names of all contributors into comments at the top of
your C file:

   /* assignment 9 */
   /* Joe Bloggs */
   /* Alice Smith */

Your solutions are due Friday 9 November at 17:00. Send each C file in
a separate email message to djb-275-hw@cr.yp.to:

   mail djb-275-hw@cr.yp.to < ex9.c
   mail djb-275-hw@cr.yp.to < ex10.c

You are not permitted to use outside functions in these problems.


9. Implement the standard div() function. Your solution must include a
definition of the div_t structure as well as code for the function.
 

10. Implement the standard ldiv() function.