Result is Number1 / Number2
which should be preferred for portability.
The result type of the division depends on the value of the global flag prefer_rationals. When it is off, the result is a float, when it is on, the result is a rational. In coroutining mode, if Number1 or Number2 are uninstantiated, the call to //3 is delayed until these variables are instantiated.
Success:
/(10, 2, 5.0).
/(10, -2.0, -5.0).
/(9, 12, 3_4). (with set_flag(prefer_rationals, on))
Fail:
/(1, 2, 1.0).
/(5, 2, r).
/(6, 2, 3).
Error:
/(A, 2, 6.0). (Error 4).
/(2, 0, Result). (Error 20).
/(4 + 2, 2, 12). (Error 24).