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Added a comment to better demonstrate custom datatypes.

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It is not obvious for a beginner (like me) to declare a new value of the temp datatype which can be either C (celsius) or F (fahrenheit). I think it would be better to demonstrate the declaration of such a datatype.
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Chariton Charitonidis 2019-03-15 11:01:23 +02:00 committed by GitHub
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@ -273,6 +273,9 @@ datatype temp =
C of real
| F of real
(* Declaring a new C temp value...
val t: temp = C 45.0 *)
fun temp_to_f t =
case t of
C x => x * (9.0 / 5.0) + 32.0