OPENFILE ... FOR WRITE

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Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly opens the file Scores.txt so data can be written to it?

A OPENFILE Scores.txt FOR WRITE

B OPENFILE "Scores.txt" FOR WRITE

2. What does FOR WRITE tell the program in OPENFILE "Scores.txt" FOR WRITE?

A The file is being opened so data can be written into it

B The file is being opened so data can be read from it

3. Which order of statements is correct?

A WRITEFILE, then OPENFILE "Scores.txt" FOR WRITE

B OPENFILE "Scores.txt" FOR WRITE, then WRITEFILE

4. Which is the correct way to write the keywords in 0478 pseudocode?

A OPENFILE "Scores.txt" FOR WRITE

B openfile "Scores.txt" for write

5. True or false: it is good practice to state the mode (FOR WRITE) every time you open a file.

A True: the mode makes clear what the program will do with the file

B False: the mode can be left out when opening a file

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 WRITE		AOPENFILE "Marks.txt" FOR WRITE
2OPENFILE "Names.txt" FOR WRITE WRITEFILE "Names.txt", Name		BThe file is opened first, then data is written into it
3The file name is a string in quotes, then the mode FOR WRITE states that you will write to the file		CThe file name is missing its quotation marks. The file identifier must be a string such as "Scores.txt".
4Keywords such as OPENFILE and FOR WRITE are written in capital letters in 0478 pseudocode		DWRITEFILE is used before the file is opened. OPENFILE ... FOR WRITE must come first.
5WRITEFILE "Scores.txt", Score OPENFILE "Scores.txt" FOR WRITE		EOpens the file Scores.txt in write mode so data can be written into it
6OPENFILE Scores.txt FOR WRITE		FOPENFILE "Results.txt" FOR WRITE

Definitions

OPENFILE "Scores.txt" FOR WRITE

Fill in the Blanks

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

________ "Scores.txt" FOR WRITE

OPENFILE "Scores.txt" ___ WRITE

OPENFILE "Scores.txt" FOR _____

OPENFILE "Scores.txt" FOR WRITE _________ "Scores.txt", Score

OPENFILE "Names.txt" FOR _____ WRITEFILE "Names.txt", Name

Spot the Error

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

Question 1

A DECLARE Name : STRING

B Name ← "Ava"

C OPENFILE "Names.txt" FOR WRITE

D READFILE "Names.txt", Name

E CLOSEFILE "Names.txt"

Question 2

A DECLARE Score : INTEGER

B OPENFILE "Data.txt" FOR READ

C Score ← 85

D WRITEFILE "Data.txt", Score

E CLOSEFILE "Data.txt"

Question 3

A DECLARE Mark : INTEGER

B Mark ← 72

C OPENFILE "Marks.txt" FOR WRITE

D WRITEFILE Mark, "Marks.txt"

E CLOSEFILE "Marks.txt"

Question 4

A DECLARE Item : STRING

B Item ← "Pen"

C OPEN "Shop.txt" FOR WRITE

D WRITEFILE "Shop.txt", Item

E CLOSEFILE "Shop.txt"

Question 5

A DECLARE Age : INTEGER

B OPENFILE "Ages.txt" WRITE

C Age ← 16

D WRITEFILE "Ages.txt", Age

E CLOSEFILE "Ages.txt"

Answer Key

OPENFILE ... FOR WRITE

Section A: Quick Questions

B — OPENFILE "Scores.txt" FOR WRITE

A — The file is being opened so data can be written into it

B — OPENFILE "Scores.txt" FOR WRITE, then WRITEFILE

A — OPENFILE "Scores.txt" FOR WRITE

A — True: the mode makes clear what the program will do with the file

Section B: Match the Pairs

OPENFILE "Scores.txt" FOR WRITE → Opens the file Scores.txt in write mode so data can be written into it

OPENFILE "Names.txt" FOR WRITE WRITEFILE "Names.txt", Name → The file is opened first, then data is written into it

The file name is a string in quotes, then the mode FOR WRITE states that you will write to the file → OPENFILE "Results.txt" FOR WRITE

Keywords such as OPENFILE and FOR WRITE are written in capital letters in 0478 pseudocode → OPENFILE "Marks.txt" FOR WRITE

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

OPENFILE Scores.txt FOR WRITE → The file name is missing its quotation marks. The file identifier must be a string such as "Scores.txt".

Section C: Definitions

OPENFILE "Scores.txt" FOR WRITE — Opens the file Scores.txt in write mode so data can be written into it with WRITEFILE. The file must be opened before writing. Keywords are in capitals.

Section D: Fill in the Blanks

OPENFILE "Scores.txt" FOR WRITE

OPENFILE "Scores.txt" FOR WRITE
WRITEFILE "Scores.txt", Score

OPENFILE "Names.txt" FOR WRITE
WRITEFILE "Names.txt", Name

Section E: Spot the Error

D — The file was opened FOR WRITE, so data must be put into it with WRITEFILE. READFILE reads data out of a file. The line should be WRITEFILE "Names.txt", Name.

B — The program wants to write Score into the file, so the file must be opened in write mode. FOR READ only allows reading. It should be OPENFILE "Data.txt" FOR WRITE.

D — WRITEFILE needs the file identifier first, then a comma, then the data to write. The arguments are the wrong way round. It should be WRITEFILE "Marks.txt", Mark.

C — The 0478 pseudocode keyword is OPENFILE, not OPEN. The line should be OPENFILE "Shop.txt" FOR WRITE.

B — The keyword FOR is missing before the mode. The correct form is OPENFILE <File identifier> FOR WRITE, so the line should be OPENFILE "Ages.txt" FOR WRITE.