Define file handling .

File handling is the use of programming techniques to work with information stored in text files .

Name the four main file handling techniques.

Opening , reading , writing and closing text files.

Write the pseudocode to open a file called Shopping.txt for writing.

OPENFILE "Shopping.txt" FOR WRITE

Write the pseudocode to read a line from fruit.txt into FruitName .

READFILE "fruit.txt", FruitName

Write the pseudocode to write the word Oranges to fruit.txt.

WRITEFILE "fruit.txt", "Oranges"

True or False? READFILE writes a line to a file.

False. READFILE reads a line from a file. WRITEFILE is the command that writes a line to a file.

The function returns TRUE when the end of a file has been reached.

The function EOF returns TRUE when the end of a file has been reached.

How do you create a new file in pseudocode?

Use OPENFILE "Shopping.txt" FOR WRITE , which overwrites the file or creates it if it does not exist.

Which mode adds data to the end of an existing file?

FOR APPEND , written as OPENFILE "Shopping.txt" FOR APPEND .

What is the difference between opening a file FOR WRITE and FOR APPEND?

FOR WRITE overwrites or creates the file, whereas FOR APPEND adds to the end of an existing file.

Which loop is used to read every line of a file until the end?

A WHILE NOT EOF(...) loop, closed with ENDWHILE .

True or False? A file should be closed before it has been fully read.

False. The file is closed after the reading loop has finished, using CLOSEFILE .

In the fruit-counting example, what does FruitCount store?

An INTEGER that keeps track of how many fruits have been read from the file.

In the fruit-counting example, what does FruitFile store?

A STRING holding the name of the file being read , "fruit.txt".

A program reads 25 integers from Data.txt into an array. Which two loop options are accepted?

A WHILE NOT EOF("Data.txt") DO ... ENDWHILE loop, or a FOR Counter ← 1 TO 25 ... NEXT Counter loop.

When reading a file into an array, how is each value stored?

DataArray[Counter] ← LineData , with Counter incremented on each pass of the loop.

When reading a file into an array with lower bound 1, Counter is initialised to before the loop.

When reading a file into an array with lower bound 1, Counter is initialised to 1 before the loop.

A LevelComputer ScienceCambridge (CIE)Flashcards10. Data Types & StructuresFiles

Files (Cambridge (CIE) A Level Computer Science): Flashcards

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Cards in this collection (20)

Define file handling.
File handling is the use of programming techniques to work with information stored in text files.
Name the four main file handling techniques.
Opening, reading, writing and closing text files.
Write the pseudocode to open a file called fruit.txt for reading.
OPENFILE "fruit.txt" FOR READ
Write the pseudocode to open a file called Shopping.txt for writing.
OPENFILE "Shopping.txt" FOR WRITE
Write the pseudocode to close a file called fruit.txt.
CLOSEFILE "fruit.txt"
Write the pseudocode to read a line from fruit.txt into FruitName.
READFILE "fruit.txt", FruitName
Write the pseudocode to write the word Oranges to fruit.txt.
WRITEFILE "fruit.txt", "Oranges"
True or False?
READFILE writes a line to a file.
False.
READFILE reads a line from a file. WRITEFILE is the command that writes a line to a file.
Write the pseudocode condition that checks the end of fruit.txt has not been reached.
IF NOT EOF("fruit.txt") THEN
The function returns TRUE when the end of a file has been reached.
The function EOF returns TRUE when the end of a file has been reached.
How do you create a new file in pseudocode?
Use OPENFILE "Shopping.txt" FOR WRITE, which overwrites the file or creates it if it does not exist.
Which mode adds data to the end of an existing file?
FOR APPEND, written as OPENFILE "Shopping.txt" FOR APPEND.
What is the difference between opening a file FOR WRITE and FOR APPEND?
FOR WRITE overwrites or creates the file, whereas FOR APPEND adds to the end of an existing file.
Which loop is used to read every line of a file until the end?
A WHILE NOT EOF(...) loop, closed with ENDWHILE.
True or False?
A file should be closed before it has been fully read.
False.
The file is closed after the reading loop has finished, using CLOSEFILE.
In the fruit-counting example, what does FruitCount store?
An INTEGER that keeps track of how many fruits have been read from the file.
In the fruit-counting example, what does FruitFile store?
A STRING holding the name of the file being read, "fruit.txt".
A program reads 25 integers from Data.txt into an array.
Which two loop options are accepted?
A WHILE NOT EOF("Data.txt") DO ... ENDWHILE loop, or a FOR Counter ← 1 TO 25 ... NEXT Counter loop.
When reading a file into an array, how is each value stored?
DataArray[Counter] ← LineData, with Counter incremented on each pass of the loop.
When reading a file into an array with lower bound 1, Counter is initialised to before the loop.
When reading a file into an array with lower bound 1, Counter is initialised to 1 before the loop.

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