$11\mathrm{.}5($Find the largest & smallest element$)$

Use pointers to write a function that finds the largest element in an array of integers. Also, write another function that finds the smallest element in an array of integers. Use $\{6,7,9,10,15,3,99,-21\}$ to test both functions.

NOTE: Solve using pointers arguments in a function call, not using Array functions. Use $($C$++)$ Include a UML diagram and implemetation for my understanding thank you.