Implement rational number operations, with appropriate operators. Example of usage:
> rat = require 'rational'
> print(rat(5, 4) * rat(3, 6))
5/8
> print(rat(5, 4) + rat(3, 6))
7/4
> print(rat(5, 2) - rat(3, 6))
2
> print(rat(5, 2) / rat(3, 6))
5
> print(rat(5, 2)^3)
125/8
> print(-rat(5, 6))
-5/6
> print(rat(5, 6) == rat(25, 30))
true
> print(rat(5, 6) <= rat(25, 30))
true
> print(rat(5, 6) < rat(5, 4))
true
> print(rat(5, 6) <= rat(5, 4))
true
> print(rat(5, 6) > rat(5, 4))
false
> print(rat.max(rat(5, 6), rat(5, 4)))
5/4
> print(rat.min(rat(5, 6), rat(5, 4)))
5/6Converting to a number can be done with the () operator:
print(rat(5, 6)())
0.83333333333333
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