The representation of an array can be defined by its declaration. A declaration means allocating memory for an array of a given size.
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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Python3
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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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 wastage 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.
Array Notes for GATE Exam [2024]
Arrays are fundamental data structures in computer science, and mastering them is crucial for success in the GATE exam. This article aims to provide concise yet comprehensive notes on arrays, covering essential concepts and strategies to help you tackle array-related questions in the GATE 2024 exam.
Table of Content
- Introduction to Arrays
- Basic terminologies of the array
- Representation of Array
- Types of arrays
- Finding Adress of an Element in Array
- Calculating the address of any element In the 1-D array
- Calculate the address of any element in the 2-D array
- Calculate the address of any element in the 3-D Array
- Previously Asked GATE Questions on Arrays
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