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]; // This array will store integer type elementchar arr[10]; // This array will store char type elementfloat arr[20]; // This array will store float type element |
C
int arr[5]; // This array will store integer type elementchar arr[10]; // This array will store char type elementfloat arr[20]; // This array will store float type element |
Java
/* Static Arrays are arrays that are declared before runtimeand are assigned values while writing the code.*/// The syntax of declaring a static array is:<data type><variable name>[] = {<data1>, <data2>,…..<dataN> };// Example:int arr[] = { 2, 5, 6, 9, 7, 4, 3 }; |
Python
# Python codearr = [10, 20, 30] # This array will store integerarr2 = ['c', 'd', 'e'] # This array will store charactersarr3 = [28.5, 36.5, 40.2] # This array will store floating elements |
C#
int[] arr = new int[5]; // This array will store integer type element |
Javascript
// JS codelet arr=[10,20,30]; // This array will store integerlet arr2 = ['c', 'd', 'e'] // This array will store characterslet arr3 = [28.5, 36.5, 40.2] // This array will store floating elements |
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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