One-dimensional arrays

Build the idea

Start with the concept and its key vocabulary.

Key idea

Use zero-based indices to create, read and change values in a 1D array.

An OCR 1D array stores several values of one type under one name and has a fixed size. Its indices begin at zero, so array names[5] has positions 0 to 4. Python uses lists for the equivalent practical tasks, although Python lists can resize.

Data structure

A method of organising and storing data so it can be accessed and used.

One-dimensional array

A fixed-size linear collection of values of one data type under one name.

Element

One value stored in an array.

Index

The zero-based position used to access an array element.

Keep these in mind

OCR declares an empty array with array name[size].
OCR also permits an array to be declared with assigned values.
Use square brackets containing an index to read or update one element.
An array of length five has no element at index five.

Build the idea

Start with the concept and its key vocabulary.

Key idea

Use zero-based indices to create, read and change values in a 1D array.

Data structure

A method of organising and storing data so it can be accessed and used.

One-dimensional array

A fixed-size linear collection of values of one data type under one name.

Element

One value stored in an array.

Index

The zero-based position used to access an array element.

Keep these in mind

OCR declares an empty array with array name[size].
OCR also permits an array to be declared with assigned values.
Use square brackets containing an index to read or update one element.
An array of length five has no element at index five.