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题目

第4题

A student uses a laptop to write a program that is saved as a text file.
(a) The laptop has utility software and an Operating System (OS).
(i) Describe the file management tasks carried out by an OS.
(ii) Explain the need for back-up software.

(b) The student compresses the file before it is emailed to their teacher as an attachment.
(i) Explain the benefits to the teacher of the attachment being a compressed file.
(ii) Describe one lossless method of compressing a text file.

( c) The student used a program library when writing their program.
Explain the benefits to the student of using library files when writing a program.

(d) The program code is written using an Integrated Development Environment (IDE).
(i) One presentation feature found in a typical IDE is prettyprint.
Identify and describe one other presentation feature found in a typical IDE.
Feature:
Description:

(ii) One debugging feature found in a typical IDE is single stepping.
Identify and describe one other debugging feature found in a typical IDE.
Feature:
Description:

答案：
4(a)(i)
1 mark for each bullet point (max 2)
e.g.

• Secondary storage space is divided into file allocation units
• Space on secondary storage is allocated to particular files
• Maintains/creates directory structures
• Specifies the logical method of file storage e.g. FAT or NTFS
• Provides file naming conventions
• Controls user access // implements access rights // implements password protection // Makes file sharing possible
• Controls access to the file by other software
• Specifies tasks that can be performed on a file e.g. open, close, delete, copy, create, move, etc.
• Allows searching for a file

• To allow data to be retrieved / restored when lost
• To automatically make a duplicate copy of data…
• … so the user does not have to remember to backup data
• To make regular duplicate copies of data

• Less of the teacher’s storage space is used
• … so more student work can b