11/14   In Fortran, runtime can be found by t1=TIME(), t2=TIME(),
         runtime=t2-t1.  What's the equivalent to TIME() in C?
        \_ man gettimeofday (time in seconds + useconds since 1970)
           \_ Or, if you're lazy and just want seconds, you can use C's
              own time() function: time_t t1 = time(NULL);