IGCSE Computer Science Paper 2 Definitions Worksheet: 8.3 File Handling (Modules 489–499)
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Key terms
Write what each term means, in your own words.
1
WRITEFILE "Scores.txt", Score
2
WRITEFILE "Names.txt", LineOfText
3
CLOSEFILE "Scores.txt"
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CLOSEFILE
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OPENFILE "Scores.txt" FOR READ
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READFILE "Scores.txt", Score
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READFILE "Names.txt", LineOfText
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DECLARE LineOfText : STRING
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FOR Count ← 1 TO 5
Answer Key
IGCSE Computer Science Paper 2 · Modules 489–499 · Student wording will vary for definitions
1WRITEFILE "Scores.txt", Score — Writes the value stored in a variable into an open file. Give the file name, a comma, then the variable. The file must already be open in WRITE mode.
2WRITEFILE "Names.txt", LineOfText — Writes the text held in the STRING variable LineOfText into the file Names.txt as one new line. Each WRITEFILE adds one more line to the file.
3CLOSEFILE "Scores.txt" — Closes the file named in the identifier once you have finished reading or writing, so data is saved and the file is released. The name must match the one used in OPENFILE.
4CLOSEFILE — Closes an open file so its data is safely saved and the file can be opened again in a different mode, such as READ after WRITE. Use one CLOSEFILE for each OPENFILE.
5OPENFILE "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.
6READFILE "Scores.txt", Score — Reads one data item from the open file and stores it in the variable. The file must already be open in READ mode, and the variable's data type must match the item.
7READFILE "Names.txt", LineOfText — Reads the next line of text from the open file Names.txt into the STRING variable LineOfText. Each READFILE call reads the following line. Declare the variable first.
8DECLARE LineOfText : STRING — The variable used with READFILE or WRITEFILE needs a data type that suits the data: STRING for a line of text, INTEGER for a whole number. A wrong type causes errors.
9FOR Count ← 1 TO 5 — A FOR loop with INPUT and WRITEFILE inside repeats a fixed number of times, writing one item to the open file on each repeat. CLOSEFILE goes after NEXT.