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int itrunc(fixed x)
Returns x with the fractional part truncated as an integer.
See the article on Rounding for all truncing modes.
itrunc(2.3) -> 2 itrunc(3.8) -> 3 itrunc(5.5) -> 5 itrunc(-2.3) -> -2 itrunc(-3.8) -> -3 itrunc(-5.5) -> -5