问题描述
我正在使用 DrScheme 来处理 SICP，并且我注意到某些程序(例如，square)被反复使用.我想把它们放在一个单独的文件中，这样我就可以将它们包含在其他程序中，而不必每次都重写它们，但我似乎不知道如何做到这一点.
I'm using DrScheme to work through SICP, and I've noticed that certain procedures (for example, square) get used over and over. I'd like to put these in a separate file so that I can include them in other programs without having to rewrite them every time, but I can't seem to figure out how to do this.
我试过了:
(load filename)
(load (filename))
(load ~/path-to-directory/filename)
(require filename)
(require ~/path-to-directory/filename)
(require path-from-root/filename)
这些都不起作用.显然，我正在抓紧稻草 - 非常感谢您的帮助.
None of these works. Obviously I'm grasping at straws -- any help is much appreciated.
推荐答案
从您的问题中不清楚您使用的是什么语言级别；某些遗留语言可能会使某些机制不可用.
It's not clear from your question what language level you're using; certain legacy languages may make certain mechanisms unavailable.
最好的包含/抽象机制是模块.
The best inclusion/abstraction mechanism is that of modules.
首先，将您的语言级别设置为模块".然后，如果我在同一目录中有这两个文件:
First, set your language level to "module". Then, if I have these two files in the same directory:
文件使用-square.ss:
File uses-square.ss:
#lang scheme
(require "square.ss")
(define (super-duper x) (square (square x)))
文件 square.ss :
File square.ss :
#lang scheme
(provide square)
(define (square x) (* x x))
然后我可以在uses-square.ss"缓冲区上点击run"，一切都会如你所愿.
Then I can hit "run" on the "uses-square.ss" buffer and everything will work the way you'd expect.
警告:未经测试的代码.
Caveat: untested code.
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