Function:
 Calculates
the ceiling function: the smallest integer not less than the input. For
example, ceiling(2.5) = 3 ceiling(-2.5) = -2
 Calculates
the floor function: the largest integer less than or equal to the input. For
example, floor(2.5) = 2 floor(-2.5) = -3
Left-hand side pins:
Value In - Any Float value x.
Value Out - ceiling(x) or floor(x)
Right-hand side pin:
Value Out - ceiling(x) or floor(x)
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