fixed ceil(fixed x)

Rounds x up and returns the result as a fixed-point number.

See the article on Rounding for all rounding modes.

ceil(2.3) -> 3.0
ceil(3.8) -> 4.0
ceil(5.5) -> 5.0
ceil(-2.3) -> -2.0
ceil(-3.8) -> -3.0
ceil(-5.5) -> -5.0