CS 536 (F03) Homework 4: Small Hints

Here are some hints and tidbits that may help with this assignment:

  1. Boxes are built-in in Scheme. Could you write a datatype for boxes?

  2. You can compare instances of datatypes using the Scheme primitive eq?. For example

    > (let ([toy (ball 15)])
        (eq? toy toy))
    > (eq? (ball 15) (ball 15)) 

  3. Remember the diagrams we drew at the end of class (also in the notes). Look at how the interpreter handles/uses the environment. Can you do something similar for the store?

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