An array in C/C++, or any programming language, is a collection of similar data items stored at contiguous memory locations, with elements accessible randomly using array indices. They can be used to hold a collection of primitive data types such as int, float, double, char, and others of any type.
In C++, array initialization involves assigning values to each of its elements. It is done either during or after the declaration. To initialize all elements, use a comma-separated list of values in curly braces {}, or assign specific values individually.
There are several ways to do this:
To access an array element, use its index number. The array index begins with 0. The last element's index is n-1.
C++ has two types of arrays:
In C++, a single-dimensional array is a linear sequence of items of the same type that are accessible via a single index, such as int arr[10];, which specifies an array of 10 integers.
In C++, a multi-dimensional array is an array of arrays, with each element being an array that may be accessed using multiple indices. For example, int matrix[3][4]; defines a 2D array (or matrix) with 3 rows and 4 columns.
This type of array has two indexes to describe each element: the first index represents a row and the second index represents a column.
The 3D array operates in three dimensions. Each element in a 3D array is uniquely identified using three indices: the row index, the column index, and the depth index.
Array traversal in C++ is the process of accessing each element of an array sequentially, generally using a loop (for, while, or do-while) to perform actions such as reading or altering the items.
Insertion in an array in C++ refers to inserting a new element at a defined place, which frequently necessitates shifting existing items to the right to create room for the new one.
In C++, deletion entails removing an element from a defined point and then shifting the other members to the left to fill the gap, preserving the array's continuous nature.
In C++, there is no length function to get array size like in Java, but we may compute the size of an array using the sizeof() operator method. First, we calculate the size of the entire array in memory and divide it by the size of the element type contained in the array. This will return the number of elements stored in the array.
In C++, a pointer to an array is a variable that stores the memory address of the array's first element. This enables the indirect access and manipulation of array elements via pointer arithmetic.
In C++, arrays can be supplied to functions by stating their name without brackets in the function call. This passes the address of the array's first element, allowing the function to directly access and modify the elements.
In C++, returning an array from a function normally means returning a pointer to the array's first element.