8.2 Arrays Cambridge IGCSE 0478

What is the primary advantage of using an array in a program?

• It allows multiple values to be stored under a single variable name.

• It eliminates the need for loops.

• It prevents errors in a program.

• It improves execution speed for all operations.

How does a one-dimensional (1D) array store data?

• As a list of values, each accessed using a single index.

• In a table format with rows and columns.

• As a linked list of separate memory locations.

• By assigning values dynamically without indexing.

In a two-dimensional (2D) array, how many indices are needed to access a value?

• Two (one for the row and one for the column).

• One (similar to a 1D array).

• Three (one for each possible dimension).

• It depends on the programming language.

What does the following pseudocode do?

• Stores the values [0, 2, 4, 6, 8] in myArray.

• Stores the values [1, 2, 3, 4, 5] in myArray.

• Stores only even numbers but does not assign them.

• Produces an error because i * 2 is not valid.

How would you access the third element in an array named scores if arrays are zero-indexed?

• scores[2]

• scores[3]

• scores[1]

• scores[0]

What is required when iterating over a 2D array?

• Nested loops (one for rows and one for columns).

• A single loop for all elements.

• A recursive function call.

• A predefined index table.

If an array data[5] is declared in a zero-indexed language, how many elements can it store?

• 5 elements

• 4 elements

• 6 elements

• It depends on the values stored.

What happens if an index outside the array bounds is accessed?

• An error occurs (e.g., "Index Out of Bounds").

• The program automatically resizes the array.

• A default value is returned instead of an error.

• The value at the last valid index is returned.

Which of the following is the correct way to store values in a 2D array in pseudocode?

• FOR i ← 0 TO 2 FOR j ← 0 TO 2

• FOR i ← 1 TO 3 FOR j ← 1 TO 3

• FOR i ← 0 TO 3 FOR j ← 0 TO 3

• FOR i ← 1 TO 2 FOR j ← 1 TO 2

If arr is a 1D array with 10 elements, what is the last valid index in a zero-indexed system?

• 9

• 10

• 8

• 0