What is array??

Question

while array needs both row and column, example of a one dimensional array.
datatype arr[4];
if 4 is number of rows or column then where is rows or column??
since we have read that in an array arr[3][4], 3 is number of rows and 4 is column.
i even didn't get the arrayyyyyyyyy..

Answer 1

array is set of elements of same type
//arr [3][4] means element in 2nd row & 3rd column
https://www.sololearn.com/learn/Java/2149/?ref=app

Answer 2

RAM is one-dimensional. As such visualizing an array as a table is fundamentally flawed. An array is just an arbitrary number of elements, occupying a chunk of RAM, with a pointer to the first element. In case you don't know a pointer is a number that represents the physical address of a variable. So you have a pointer to the beginning of the array and arr[2] is just syntactical sugar for *(arr+2), or "get me the value stored at the address arr+2". (this is also why arrays start indexing at 0).

Two-dimensional arrays are a little more complicated. You have a pointer to a list of pointers, and each of those pointers points to a list of elements. So arr[2][3] means "get me the value that is stored in memory 3*n bytes (where n is the size of the data type) after arr[2]".

TL;DR: while arr[row][column] makes more sense, it doesn't matter as long as you're consistent and understand what is *actually* going on under the hood.