public boolean bothEvenOrBothDifferent(int a, int b).
Given two integers, return true
(A) if both of them are even or
(B) if one is even and the other is odd.

Return false if both numbers are odd.

A number is EVEN if, when you divide it by 2, its remainder is zero, e.g. num % 2 == 0.
A number is ODD if, when you divide it by 2, its remainder is NOT zero, e.g. num % 2 != 0.