ex 12.3.7 search func
ex 12.3.8 -- clear array with pointer arithmetic
ex 12.3.9 inner product via pointer arithmetic
ex 12.3.10 - find middle w/ pointer arithmetic
ex 12.3.11 -- find max w/ pointer arithmetic
ex 12.3.12 - 2 largest via pointer arithmetic
ex 12.4.13 - init identity matrix, pointer arithmetic style
ex 12.4.14 - pass rows as args to search func
ex 12.4.15 -- access elements of a row via pointer  (print temps table)
ex 12.4.16 - print high temp for each day in temps table