RE: if

[Calum Grant]

> If you want to write practical Prolog programs, there is every need
> for an if-then-else construct.

Yes.

> In logic languages which don't have if-then-else, but which do have
> cut, e.g. Lambda Prolog, you can simulate if-then-else using cut.
> But this is a hack; it's nicer if the language supports if-then-else
> directly.

I always thought ! and -> compiled to the same thing.  I tend always to use
the ! notation since I find it easier to understand what's going on.  I am a
bit of a purist though, and dislike either.

Calum
--
  Calum Grant - address@hidden - 01223 569700

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