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- a number
n; - a sum
(make-sum ae1 ae2); - a product
(make-prod ae1 ae2); - a difference
(make-diff ae1 ae2); or - a quotient
(make-quot ae1 ae2);
where n is a Scheme number, and ae1 and ae2 are arith-exprs .
The following 4 exercises involve the data type arith-expr. If you are asked to write a function(s), follow the design recipe: contract, purpose, examples/tests, template instantiation, code, testing (which happens automatically if when the examples are given in (check-expect ...) form). Follow the same recipe for any help function that you introduce.
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