[Oberon] CASE without ELSE
fusionfile at gmail.com
Thu Feb 15 17:52:12 CET 2018
On 2018-02-15 16:12, Jörg wrote:
> The compiler doesn’t even implement the numeric case.
If I understand it correctly, for integer and character case
expressions, the case statement may trap unmatched expressions. This is
beneficial when the expression is a variable of an enumerated type
(semantically) since it implies that the statement should handle all
cases. Unfortunately the compiler cannot enforce it.
> NW writes:
> The case statement performs the same function as the if statement.
> However, it is intended to use a different technique of implementation,
> namely a single, indexed branch instead of a cascade of conditional
> branches. This is sensible only if the cases are distinguished by a
> (mostly) contiguous range of label values.
This is in line with Wirth's idea that no language construct should have
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