SQL Server 2014 :: CASE Condition Not Affecting CAST Output

I've a variable in my SP that I'd like to use to change the format of my output. Try this!

select case when 1=2 then cast(1 as decimal(10,2)) else cast(2 as decimal(10,0)) end

Then this:

select case when 1=1 then cast(1 as decimal(10,2)) else cast(2 as decimal(10,0)) end

Why in either case, the output is returned as n.nn ? Whilst single select expressions (like these):

select cast(1 as decimal(10,2)) -- = 1.00
select cast(2 as decimal(10,0)) -- = 2

Work fine.