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Given: ⌈x⌉ is defined as the least integer greater than or equal to x.
⌊x⌋ is defined as the greatest integer less than or equal to x.

Define g(x)=⌊x+0.5⌋−⌈x−0.5⌉.

Asked: Evaluate g(3.9).

g(3.9) = ⌊3.9+0.5⌋−⌈3.9−0.5⌉= ⌊4.4⌋−⌈3.4⌉ = 4 - 4 = 0

IMO D
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in such question it generalise the answer it helps to take x as is so ⌊x+0.5⌋= x (less than x+0.5) and ⌈x−0.5⌉ = x (greater than x-0.5) so answer will be 0 without trying for 3.9
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