What is the index of an array?

The index of a value in an array is that value’s location within the array. There is a difference between the value and where the value is stored in an array.

What is the purpose of index in array?

When data objects are stored in an array, individual objects are selected by an index that is usually a non-negative scalar integer. Indexes are also called subscripts. An index maps the array value to a stored object.

What is the difference between length and size of ArrayList?

Array has length property which provides the length of the Array or Array object. The java ArrayList has size() method for ArrayList which provides the total number of objects available in the collection. …

What is the base address of the index of an array?

Address of a [index] is equal to (base Address+ Size of each element of array * index). int arr [5]; //an array with one row and five columns will be created. int arr [2] [5]; //an array with two rows and five columns will be created.

What is the difference between a structure and an array?

We have seen that a structure allows elements of different data types to be grouped together under a single name. This structure can then be thought of as a new data type in itself. So, an array can comprise elements of this new data type.

What are the different types of indexing in an array?

Types of indexing in an array: 1 (zero-based indexing): The first element of the array is indexed by a subscript of 0 2 (one-based indexing): The first element of the array is indexed by the subscript of 1 3 n (n-based indexing): The base index of an array can be freely chosen.

Can an array have a negative index?

Usually, programming languages allowing n-based indexing also allow negative index values, and other scalar data types like enumerations, or characters may be used as an array index. Here the value 5 is printed because the first element has index zero and at zeroth index we already assigned the value 5.