Question

What is an Array? Show how you create, populate and access the elements of any array.

Hint:

Array indexing in most programming languages starts from \(0\), meaning the first element is accessed using index \(0\).

Answer 1

Step 1: Define an Array.

An array is a collection of elements of the same data type stored in contiguous memory locations. Each element in an array can be accessed using an index number.

Arrays are used to store multiple values in a single variable, which helps in efficient data handling and reduces the need to declare many separate variables.

Step 2: Creating an Array.

In Python, arrays can be created using the array module.

Example:

from array import *

arr = array('i', [10,20,30,40])

Here 'i' represents integer type elements and the values inside the list are the array elements.

Step 3: Populating an Array.

Elements can be inserted or added to an array using methods such as append() or insert().

Example:

arr.append(50)
arr.insert(2,25)

This adds new elements into the array.

Step 4: Accessing Elements of an Array.

Array elements are accessed using index numbers starting from 0.

Example:

print(arr[0])

This prints the first element of the array.

Step 5: Conclusion.

Thus an array stores multiple values of the same type, and its elements can be created, populated, and accessed easily using indexing and array operations.