File identifier: the file name as a string

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Quick Questions

Shade in the A or B circle for each question.

1. Which line uses a correct file identifier?

A OPENFILE FileA.txt FOR WRITE

B OPENFILE "FileA.txt" FOR WRITE

2. A file identifier is which data type?

A INTEGER

B STRING

3. Which file identifier includes the extension?

A "Scores.txt"

B "Scores"

4. A program writes to "Names.txt" and later reads the same data back. Which is correct?

A Use "Names.txt" in every file command

B Use a different file name for each command

5. Which pair of lines uses the identifier consistently?

A OPENFILE "Data.txt" FOR WRITE and CLOSEFILE "Data.txt"

B OPENFILE "Data.txt" FOR WRITE and CLOSEFILE "Info.txt"

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1OPENFILE "FileA.txt" FOR WRITE		AThe identifier is not the same in both commands. The first has no .txt extension, so the commands refer to different files.
2"Scores.txt"		BOPENFILE "Names.txt" FOR WRITE
3The same file identifier must be used in every file command that works on that file.		CThe file identifier has no double quotes. A file identifier is a STRING, so it must be written as "FileA.txt".
4A file identifier is a STRING value, so the file name goes inside double quotes and includes the extension .txt.		DOPENFILE "Data.txt" FOR READ READFILE "Data.txt", Line CLOSEFILE "Data.txt"
5OPENFILE FileA.txt FOR WRITE		EOpens the file named FileA.txt so data can be written to it. The file identifier is a string in double quotes.
6OPENFILE "Scores" FOR READ CLOSEFILE "Scores.txt"		FA file identifier: the file name written as a STRING value, in double quotes, with its extension.

Definitions

"FileA.txt"

Fill in the Blanks

Complete each line of code by filling in the missing parts.

OPENFILE "Scores.txt" FOR READ READFILE "__________", Score

OPENFILE "Names____" FOR WRITE

DECLARE FileName : ______ FileName ← "Data.txt" OPENFILE FileName FOR READ

OPENFILE "Log.txt" FOR WRITE WRITEFILE "Log.txt", "Done" CLOSEFILE "_______"

FileName ← "Data.txt" OPENFILE ________ FOR READ READFILE FileName, Line

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A DECLARE Name : STRING

B OPENFILE "Names.txt" FOR WRITE

C WRITEFILE Names.txt, Name

D CLOSEFILE "Names.txt"

Question 2

A DECLARE Line : STRING

B OPENFILE "Diary.txt" FOR READ

C READFILE "Diary.txt", Line

D CLOSEFILE "Dairy.txt"

Question 3

A DECLARE Mark : INTEGER

B OPENFILE "Mark.txt" FOR WRITE

C WRITEFILE "Marks.txt", Mark

D CLOSEFILE "Marks.txt"

Question 4

A DECLARE Entry : STRING

B OPENFILE "Log.txt" FOR READ

C READFILE 'Log.txt', Entry

D CLOSEFILE "Log.txt"

Question 5

A DECLARE Score : INTEGER

B OPENFILE "Quiz.txt" FOR WRITE

C Score ← 15

D WRITEFILE "Quiz.txt, Score

E CLOSEFILE "Quiz.txt"

Answer Key

File identifier: the file name as a string

Section A: Quick Questions

B — OPENFILE "FileA.txt" FOR WRITE

B — STRING

A — "Scores.txt"

A — Use "Names.txt" in every file command

A — OPENFILE "Data.txt" FOR WRITE and CLOSEFILE "Data.txt"

Section B: Match the Pairs

OPENFILE "FileA.txt" FOR WRITE → Opens the file named FileA.txt so data can be written to it. The file identifier is a string in double quotes.

"Scores.txt" → A file identifier: the file name written as a STRING value, in double quotes, with its extension.

The same file identifier must be used in every file command that works on that file. → OPENFILE "Data.txt" FOR READ READFILE "Data.txt", Line CLOSEFILE "Data.txt"

A file identifier is a STRING value, so the file name goes inside double quotes and includes the extension .txt. → OPENFILE "Names.txt" FOR WRITE

OPENFILE FileA.txt FOR WRITE → The file identifier has no double quotes. A file identifier is a STRING, so it must be written as "FileA.txt".

OPENFILE "Scores" FOR READ CLOSEFILE "Scores.txt" → The identifier is not the same in both commands. The first has no .txt extension, so the commands refer to different files.

Section C: Definitions

"FileA.txt" — A file identifier is the name of the file, written as a string in double quotes with its extension, such as "FileA.txt". The same identifier is used in every file command.

Section D: Fill in the Blanks

OPENFILE "Scores.txt" FOR READ
READFILE "Scores.txt", Score

OPENFILE "Names.txt" FOR WRITE

DECLARE FileName : STRING
FileName ← "Data.txt"
OPENFILE FileName FOR READ

OPENFILE "Log.txt" FOR WRITE
WRITEFILE "Log.txt", "Done"
CLOSEFILE "Log.txt"

FileName ← "Data.txt"
OPENFILE FileName FOR READ
READFILE FileName, Line

Section E: Spot the Error

C — The file identifier is a string, so it must be in double quotes. Line 3 should be WRITEFILE "Names.txt", Name.

D — The same identifier must be used in every file command. "Dairy.txt" is a different name from "Diary.txt". Line 4 should be CLOSEFILE "Diary.txt".

B — The identifier here is "Mark.txt", but the other commands use "Marks.txt". It must be the same in every file command. Line 2 should be OPENFILE "Marks.txt" FOR WRITE.

C — In 0478 pseudocode a string, including a file identifier, is written in double quotes, not single quotes. Line 3 should be READFILE "Log.txt", Entry.

D — The closing double quote after the extension is missing, so the identifier is not a complete string. Line 4 should be WRITEFILE "Quiz.txt", Score.