OPENFILE ... FOR READ

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Quick Questions

Shade in the A or B circle for each question.

1. Which line opens the existing file Scores.txt so a program can read from it?

A OPENFILE "Scores.txt" FOR READ

B OPENFILE "Scores.txt" FOR WRITE

2. True or false: A file must already exist before you can use OPENFILE ... FOR READ on it.

A False

B True

3. Which order is correct for reading a line from a file?

A OPENFILE "Scores.txt" FOR READ, then READFILE "Scores.txt", Line

B READFILE "Scores.txt", Line, then OPENFILE "Scores.txt" FOR READ

4. What happens to the data stored in Scores.txt when you run OPENFILE "Scores.txt" FOR READ?

A The old data is erased

B The data stays exactly the same

5. Which statement is correct about the file identifier in OPENFILE "Scores.txt" FOR READ?

A "Scores.txt" is the file name, written as a string

B Scores.txt is a variable, so it has no quote marks

Match the Pairs

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

Left column		Right column
1OPENFILE "Scores.txt" FOR READ		AOPENFILE "Results.txt" FOR READ
2OPENFILE "Names.txt" FOR READ READFILE "Names.txt", Name		BREADFILE is used before the file is opened. OPENFILE ... FOR READ must come first.
3A file must be opened in READ mode before any data is read from it		COpens Names.txt first, then reads one line from it into the variable Name
4READ mode opens a file that already exists and holds data, so it is not used to create a new file		DOpens the existing file Scores.txt so the program can read data from it
5OPENFILE Scores.txt FOR READ		EOPENFILE "Scores.txt" FOR READ READFILE "Scores.txt", Score
6READFILE "Scores.txt", Score OPENFILE "Scores.txt" FOR READ		FThe file name is not in quotation marks. The file identifier must be a string, so it should be "Scores.txt".

Definitions

OPENFILE "Scores.txt" FOR READ

Fill in the Blanks

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

________ "Scores.txt" FOR READ

OPENFILE "Scores.txt" ___ READ

OPENFILE "Scores.txt" FOR ____

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

DECLARE Score : INTEGER OPENFILE "Scores.txt" FOR READ READFILE "Scores.txt", _____

Spot the Error

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

Question 1

A OPENFILE "Scores.txt" FOR WRITE

B READFILE "Scores.txt", Score

C OUTPUT Score

D CLOSEFILE "Scores.txt"

Question 2

A DECLARE Score : INTEGER

B OPENFILE "Scores.txt" READ

C READFILE "Scores.txt", Score

D OUTPUT Score

E CLOSEFILE "Scores.txt"

Question 3

A DECLARE Mark : INTEGER

B OUTPUT "Reading marks"

C OPENFILE "Marks.txt" FOR READ

D READFILE "Marks.txt" Mark

E OUTPUT Mark

Question 4

A DECLARE Score : INTEGER

B OPENFILE "Scores.txt" FOR READ

C WRITEFILE "Scores.txt", Score

D OUTPUT Score

Question 5

A DECLARE Total : INTEGER

B OPENFILE Scores.txt FOR READ

C READFILE "Scores.txt", Total

D OUTPUT Total

Answer Key

OPENFILE ... FOR READ

Section A: Quick Questions

A — OPENFILE "Scores.txt" FOR READ

B — True

A — OPENFILE "Scores.txt" FOR READ, then READFILE "Scores.txt", Line

B — The data stays exactly the same

A — "Scores.txt" is the file name, written as a string

Section B: Match the Pairs

OPENFILE "Scores.txt" FOR READ → Opens the existing file Scores.txt so the program can read data from it

OPENFILE "Names.txt" FOR READ READFILE "Names.txt", Name → Opens Names.txt first, then reads one line from it into the variable Name

A file must be opened in READ mode before any data is read from it → OPENFILE "Scores.txt" FOR READ READFILE "Scores.txt", Score

READ mode opens a file that already exists and holds data, so it is not used to create a new file → OPENFILE "Results.txt" FOR READ

OPENFILE Scores.txt FOR READ → The file name is not in quotation marks. The file identifier must be a string, so it should be "Scores.txt".

READFILE "Scores.txt", Score OPENFILE "Scores.txt" FOR READ → READFILE is used before the file is opened. OPENFILE ... FOR READ must come first.

Section C: Definitions

OPENFILE "Scores.txt" FOR READ — Opens the existing file Scores.txt in READ mode so the program can read data from it with READFILE. The file must already exist, and READ mode does not change its contents.

Section D: Fill in the Blanks

OPENFILE "Scores.txt" FOR READ

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

DECLARE Score : INTEGER
OPENFILE "Scores.txt" FOR READ
READFILE "Scores.txt", Score

Section E: Spot the Error

A — The program wants to read existing data, so the file must be opened in READ mode. FOR WRITE would replace the contents. It should be OPENFILE "Scores.txt" FOR READ.

B — The keyword FOR is missing before the file mode. It should be OPENFILE "Scores.txt" FOR READ.

D — READFILE needs a comma between the file identifier and the variable. It should be READFILE "Marks.txt", Mark.

C — The file was opened FOR READ, so the program must use READFILE to get data from it. WRITEFILE is for a file opened in WRITE mode. It should be READFILE "Scores.txt", Score.

B — The file identifier is a string, so it needs quotation marks. It should be OPENFILE "Scores.txt" FOR READ.