Array Representation in Data Structures
Last Updated :
20 Jul, 2023
Representation of Array
The representation of an array can be defined by its declaration. A declaration means allocating memory for an array of a given size.
Array
Arrays can be declared in various ways in different languages. For better illustration, below are some language-specific array declarations.
C++
int arr[5];
char arr[10];
float arr[20];
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C
int arr[5];
char arr[10];
float arr[20];
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Java
<data type><variable name>[]
= {<data1>, <data2>,…..<dataN> };
int arr[] = { 2, 5, 6, 9, 7, 4, 3 };
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Python
arr = [10, 20, 30]
arr2 = ['c', 'd', 'e']
arr3 = [28.5, 36.5, 40.2]
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C#
Javascript
let arr=[10,20,30];
let arr2 = ['c', 'd', 'e']
let arr3 = [28.5, 36.5, 40.2]
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Array declaration
However, the above declaration is static or compile-time memory allocation, which means that the array element’s memory is allocated when a program is compiled.
Here only a fixed size (i,e. the size that is mentioned in square brackets []) of memory will be allocated for storage, but don’t you think it will not be the same situation as we know the size of the array every time, there might be a case where we don’t know the size of the array. If we declare a larger size and store a lesser number of elements will result in a waste of memory or either be a case where we declare a lesser size then we won’t get enough memory to store the rest of the elements. In such cases, static memory allocation is not preferred.
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