IGCSE Computer Science Paper 2 Word Scramble: 8.2 Arrays and 8.3 File Handling (Modules 479–488)
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Word scramble
Unscramble the letters and write each key term on the line.
1
RCTEA ELTAB
Tracks Row, Column and the element changed. The outer loop variable stays fixed while the inner one runs through all its values. Total passes = rows x columns.
2
D1 RO D2 RAARY
Use a 1D array for a simple list of values. Use a 2D array when data forms a table or grid, so each value needs two indexes: a row and a column.
3
OMMNOC RAAYR KSASTIEM
Typical bugs: loop limits not matching ARRAY[l:u], swapped row and column indexes, a total not reset to 0, or the wrong data type stored. Check bounds, index order and starting values.
4
ELFI
A ______ keeps data on storage so it still exists after the program closes, unlike variables. The program can read it back next time it runs, such as a saved high score or a list of names.
5
"ILFXE.TAT"
A file identifier is the name of the file, written as a string in double quotes with its extension, such as ______. The same identifier is used in every file command.
6
EFLI DOME
States what a program will do with an open file: READ gets data out of it, WRITE puts data into it. A file is open in only one mode at a time, chosen by what the program needs.
Answer Key
IGCSE Computer Science Paper 2 · Modules 479–488
1RCTEA ELTAB → trace table — Tracks Row, Column and the element changed. The outer loop variable stays fixed while the inner one runs through all its values. Total passes = rows x columns.
2D1 RO D2 RAARY → 1D or 2D array — Use a 1D array for a simple list of values. Use a 2D array when data forms a table or grid, so each value needs two indexes: a row and a column.
3OMMNOC RAAYR KSASTIEM → common array mistakes — Typical bugs: loop limits not matching ARRAY[l:u], swapped row and column indexes, a total not reset to 0, or the wrong data type stored. Check bounds, index order and starting values.
4ELFI → file — A file keeps data on storage so it still exists after the program closes, unlike variables. The program can read it back next time it runs, such as a saved high score or a list of names.
5"ILFXE.TAT" → "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.
6EFLI DOME → file mode — States what a program will do with an open file: READ gets data out of it, WRITE puts data into it. A file is open in only one mode at a time, chosen by what the program needs.