X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=assignment7.mdwn;h=d6cb6813125279b02da88d34757d4d75b92415e6;hp=9be93e778758b9457826e89c3a1f18534b7d326b;hb=3a24f457b5d8dfe280e95913d3b13d65f31b6fe8;hpb=5d3d0a72ea4e8f1d23816d851fed8027ce768864 diff --git a/assignment7.mdwn b/assignment7.mdwn index 9be93e77..d6cb6813 100644 --- a/assignment7.mdwn +++ b/assignment7.mdwn @@ -7,7 +7,7 @@ Write a monadic operation that enables you to retrieve the last-saved remainder, at any arbitrary later point in the computation. For example, you want to be able to calculate expressions like this: - (((some_long_computation / 12) + 5) - most_recent_remainder) * 2 - same_most_recent_remainder +1 + (((some_long_computation / 12) + 5) - most_recent_remainder) * 2 - same_most_recent_remainder + 1 The remainder here is retrieved later than (and in addition to) the division it's the remainder of. It's also retrieved more than once. Suppose a given remainder remains retrievable until the next division is performed. @@ -19,7 +19,7 @@ * You don't need to re-express the epistemic modality part of their semantics, just their treatment of extensional predicate logic. Though extra credit if you want to do the whole thing. - * You'll want to use the implementation of "implicitly represented" mutable variables that we discussed at the end of this week's meeting, or the "state monad" Chris presented, which is a simple version of the former. + * You'll want to use "implicitly represented" mutable variables, or a State monad. * Here are some [hints](/hints/assignment_7_hint_1).