8.7
#lang racket ;; this code defines the sim-JYSS5 language as a module (module sim-JYSS5 racket (provide [rename-out (#%lam-app #%app)] #%module-begin #%datum + - * / = equal? <= => if vars:) (define-syntax (#%lam-app stx) (syntax-case stx (proc go) [(_ proc (args ...) go body) #'(lambda (args ...) body)] [(_ e ...) #'(#%app e ...)])) (define-syntax vars: (syntax-rules (body:) [(vars: [v = e] ... body: eb) ((lambda (v ...) eb) e ...)])) ) (module my-mod1 (submod ".." sim-JYSS5) 1234 4567 (+ 4 5) (vars: [x = 14] [y = 7] body: {+ x y}) ;; exercise 0: Give the name `f` to the function that ;; accepts an argument `x` and computes x^2 + 4x + 4. ;; apply `f` to seven. ;; exercise 1: Use the trick discussed in class to define ;; a `fact` function that computes the factorial of a given ;; number. Use it to compute the factorial of 12. ;; exercise 2: Define a 'pow' function that accepts a base ;; and a (natural number) exponent, and computes the base to ;; the power of the exponent. Don't worry about non-natural ;; number exponents (6^1.5, 5^-4). ;; exercise 3: use `fact` and `pow` to build a "sin" function ;; that accepts a number x and a number of terms `n`, and computes ;; (sin x) using `n` terms of the taylor expansion. (Note that ;; this is a little ambigious; do zero-coefficient terms count? ;; You can go either way on this.) Use this function to compute ;; the sine of 1 radian to an error of no more than ten to the minus ;; 30th. ) (require 'my-mod1)