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