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func main()
n := 1.5
assert n == 1.5
assert n + n == 3.
assert n * 2 == 3.
assert n - n == 0.
assert Num.PI == 3.141592653589793
assert Num.PI.with_precision(0.01) == 3.14
assert Num.INF == Num.INF
assert Num.INF.isinf()
none_num : Num? = none
assert none_num == none
assert none_num == none_num
assert (none_num < none_num) == no
assert (none_num > none_num) == no
assert (none_num != none_num) == no
assert (none_num <> none_num) == Int32(0)
assert (none_num == 0.0) == no
assert none_num < 0.0
assert (none_num > 0.0) == no
assert none_num != 0.0
assert (none_num <> 0.0) == Int32(-1)
# >> nan + 1
# = none
>> 0./0.
# >> 0./0.
# = none
assert Num.PI.cos()!.near(-1)
assert Num.PI.sin()!.near(0)
assert Num.INF.near(-Num.INF) == no
assert Num32.sqrt(16) == Num32(4)
assert Num32.sqrt(-1) == none
assert (0.25).mix(10, 20) == 12.5
assert (2.0).mix(10, 20) == 30.
assert Num(5) == 5.
assert (0.5).percent() == "50%"
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