int iround(fixed x)
Rounds x to the nearest integer and returns the result as an integer.
See the article on Rounding for all rounding modes.
iround(2.3) -> 2 iround(3.8) -> 4 iround(5.5) -> 6 iround(-2.3) -> -2 iround(-3.8) -> -4 iround(-5.5) -> -5