CASE equivalent of a nested IIF statement

Question

Can anyone please decode the following nested IIF to a CASE statement in SQL.. I know IIF is allowed in SQL Server 2012 but I find it hard to get an easy grasp of a nested IIF l

Answer 1

This should be the equivalent:

CASE
    WHEN
        CASE
            WHEN TABLE_A.Col_1 = 0
            THEN TABLE_A.Col_2 + (2*TABLE_A.Col_3)
            ELSE TABLE_A.Col_1
        END <= .5
    THEN 'A'
    ELSE 'B'
END As Result