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Assignment代写:Your Computer’s File System

2018-04-16 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- Your Computers File System,供大家参考学习,这篇论文讨论了比较冷门的Racket语言。

Racket语言,le system,assignment代写,cs代写,作业代写

In this exercise, you’ll learn to write programs that explore your computer’s le system. Speci cally, you’ll be writing:

• Procedures to back up your le system by copying folders and les from one location to another, and

• Procedures to search your le system for les of a certain name, extension, etc. Introduction: File system terminology

There are three concepts from le systems we are using here: les, folders, and paths. File systems are shaped like trees, so this should feel familiar from past assignments. If you feel comfortable with le system data structures, feel free to skip this section.

• Files have names and contain data, like the .rkt le you’re currently working in. (These are like leaf nodes on a tree.)

• Folders, also known as directories, are recursive structures that have names and contain two types of data:

– Files

– Other folders

Folders are like non-leaf nodes on trees.

• Paths represent where to nd les in a le system. They consist of a sequence of folder names, and may or may not end in a le name. For example:

– /test/Test2/bar.txt says there is a folder test, which contains a folder called Test2, which contains a le called bar.txt and we are referring to this le.

– /test/Test3/ says there is a folder test, which contains a folder called Test3, and we are referring to this folder.

You may have seen paths written as strings, with folder names separated by a “/”. In Racket, paths are their own data type – they are NOT strings.

To create a new path, use build-path : string … -> Path: (build-path “test” “Test2” “bar.txt”) ; /test/Test2/bar.txt

(build-path “test” “Test3”) ; /test/Test3/

You can also convert between the two data types using the procedures string->path and

path->string:

(define p (build-path “test” “Test3”))

(path->string p) ; “test/Test3”

(string->path “test/Test2/bar.txt”) ; # 1

Figure 1: Sample le system for this assignment

In this assignment, you will use the sample le system we have created for you to test with:

The functions you’ll be writing have real side e ects (for instance, delete-file! will actually delete real les). As a safeguard, all of these operations will only work on les and directories that are descendants of the folder where your assignment le is saved.

However, this does not prevent you from accidentally deleting your homework. BE CAREFUL NOT TO DO THIS! Make sure that whenever you close DrRacket, your homework le still exists. We will not grant extensions for accidentally erasing your work. #imperative programming

Troubleshooting documentation

All of the le operations you need for this assignment are documented under cs111/file-operations. If, when you search, you see something like this:

Figure 2: “No matches found in Advanced Student”

then click the “clear” link and the documentation you’re looking for should appear.

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