IGCSE Computer Science Paper 2 Word Scramble: 8.2 Arrays (Modules 469–478)
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Word scramble
Unscramble the letters and write each key term on the line.
1
WRSO * LNUCOMS
The total number of elements in a 2D array. Each dimension holds upper - lower + 1 values, so ARRAY[1:3, 1:3] holds 3 * 3 = 9 and ARRAY[1:30, 1:4] holds 30 * 4 = 120.
2
WMAR[ONE, LUOMCN] ← EALVU
Stores a value in one element of a 2D array. Give the row index first, then the column index, e.g. NoughtsAndCrosses[2,3] ← 'X' puts a CHAR in row 2, column 3.
3
OMEW[NRA, NMOLCU]
Gives the value stored at that row and column of a 2D array. Use it in an expression or OUTPUT, e.g. OUTPUT NoughtsAndCrosses[2,3] shows the value at row 2, column 3.
4
ORRI[GWD, NMOLCU]
Uses two variables as the row and column indexes, so one statement can reach any element of a 2D array. Both variables must stay within their bounds.
5
DNTSEE OFR PLOO
A FOR loop for the columns placed inside a FOR loop for the rows. The inner loop runs fully for each row, so every element of a 2D array is visited and given a value.
6
UTPTOU RANM[EOW, UNOMCL]
Placed inside nested FOR loops (outer loop for rows, inner loop for columns), this line displays each element of a 2D array once, in row order.
Answer Key
IGCSE Computer Science Paper 2 · Modules 469–478
1WRSO * LNUCOMS → rows * columns — The total number of elements in a 2D array. Each dimension holds upper - lower + 1 values, so ARRAY[1:3, 1:3] holds 3 * 3 = 9 and ARRAY[1:30, 1:4] holds 30 * 4 = 120.
2WMAR[ONE, LUOMCN] ← EALVU → Name[row, column] ← value — Stores a value in one element of a 2D array. Give the row index first, then the column index, e.g. NoughtsAndCrosses[2,3] ← 'X' puts a CHAR in row 2, column 3.
3OMEW[NRA, NMOLCU] → Name[row, column] — Gives the value stored at that row and column of a 2D array. Use it in an expression or OUTPUT, e.g. OUTPUT NoughtsAndCrosses[2,3] shows the value at row 2, column 3.
4ORRI[GWD, NMOLCU] → Grid[Row, Column] — Uses two variables as the row and column indexes, so one statement can reach any element of a 2D array. Both variables must stay within their bounds.
5DNTSEE OFR PLOO → nested FOR loop — A FOR loop for the columns placed inside a FOR loop for the rows. The inner loop runs fully for each row, so every element of a 2D array is visited and given a value.
6UTPTOU RANM[EOW, UNOMCL] → OUTPUT Name[Row, Column] — Placed inside nested FOR loops (outer loop for rows, inner loop for columns), this line displays each element of a 2D array once, in row order.