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Homework5 作业分析

Homework5 作业分析. 张一鸣 5110379070. Homework5. 整体情况 错题分析 Challenge. Homework5. 整体情况 完成对一个自定义语言MUPL的简易编译器 24人上交了作业 4个人做了Challenge 18个人拿到了满分（不算Challenge）. Homework5. 错题分析 鉴于每题都有人错，所以就都稍微讲一下. Homework5. 1-a(wrong 1) racketlist->mupllist 2-a(wrong 2) mupllist->rackerlist. Homework5.

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Homework5 作业分析

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  1. Homework5 作业分析 张一鸣5110379070

  2. Homework5 • 整体情况 • 错题分析 • Challenge

  3. Homework5 • 整体情况 • 完成对一个自定义语言MUPL的简易编译器 • 24人上交了作业 • 4个人做了Challenge • 18个人拿到了满分（不算Challenge）

  4. Homework5 • 错题分析 • 鉴于每题都有人错，所以就都稍微讲一下

  5. Homework5 • 1-a(wrong 1) • racketlist->mupllist • 2-a(wrong 2) • mupllist->rackerlist

  6. Homework5 • 2 (wrong 2) • 解析一个mupl的表达式 • 错在同一个地方

  7. Homework5 • 3-a (wrong 2) • 注意 0 要用 (int 0) • 没用 ifgreater • 正确

  8. Homework5 • 3-b (wrong 4) • 和let*一样的效果 • 正确答案 • 有2个同学在原本应该返 回e2 时返回了(e2)

  9. Homework5 • 3-c (wrong 1) • if e1 = e2 then e3 else e4 • 正确答案 • 唯一错误的同学是因为少了一个括号 →_→|||

  10. Homework5 • 4-a (wrong 2) & 4-b(wrong 2) • 写mupl的map函数 • 正确答案： • 错误的同学错误原因类似，对于题目理解错误。

  11. Homework5 • Challenge！ • 目标：主要区别在于closure，在解析fun的时候构建closure，challenge要求用只含有free variable的environment代替原来的environment. • Free variable ：在函数体中除了函数自己、参数和函数体内声明（let, letrec .etc）的变量。

  12. Homework5 • Challenge！ • compute-free-vars 把所有的fun替换为带有free variable的 fun-challenge.

  13. Homework5

  14. Homework5 • Challenge！ • eval-under-env-c 按照eval-under-env的方式解析，主要有变化的是对fun-challenge的解析 • build-freevars-env

  15. 谢谢！！

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