Completed do-while.php exercise 1

Created a do-while loop that counts by 2 until 100, starting at 0 –
follow each number with a new line.
Completed do-while.php exercise 2

Altered do-while loop to count backward by 5’s, starting with 100 and
ending with -10.
Completed do-while.php exercise 3

Altered do-while loop to start at 2 and echo the result of $a * $a on
each line while $a is less than 1,000,000.

Output should equal:
2
4
256
65536