rsakamot https://blog.hatena.ne.jp/rsakamot/ さかもとのブログ https://rskmt.hateblo.jp/ SICP いまいちわからなかったので，参照した. ;exercise4.3 (define (eval exp env) (cond [(self-evaluating? exp) exp] [(variable? exp) (lookup-variable-value exp env)] [else (if (get 'eval (operator exp)) ((get 'eval (operator exp)) exp env) (if (application? exp) (apply (eval (operator exp) env) (list-of-values (operands exp… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Frskmt.hateblo.jp%2Fentry%2F20090623%2F1245733705" title="ＳＩＣＰ演習問題4.3 - さかもとのブログ" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-06-23 14:08:25 rich https://rskmt.hateblo.jp/entry/20090623/1245733705 1.0 100%