Arrays
Computer Science: OCR A Level, topic 4.1.3
Arrays
Arrays are really useful when you have access to large amounts of related data, but you don't want to store in multiple variables.
Arrays
- An array is a data structure that stores a fixed number of values under a single identifier.
- The values must be of the same type.
Array elements
- Each piece of data inside an array is called an element.
- Each element has an index, which is its position within the array.
- We start counting the indices from 0.
Arrays in pseudocode
- An array of ten items can be created using the following syntax:
- array name_of_array[10]
- Values can be assigned as follows:
- name_of_array[0] = "Hello"
- Values can be accessed as follows:
- print(name_of_array[0])
Test yourself on Arrays
Toggle until all are correct: Which of these is true of arrays?
How do we access the first element of an array?