An array is a systematic arrangement of similar objects, usually in rows and columns.

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27 views

How can I find Histogram using arrays? What's wrong in my code? [on hold]

Build/Output Histograms using Arrays?This program takes 10 input from user and print * Where i'm Wrong? public class P20 { public static void main(String[] args) { int[] anArray; int ...
-3
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0answers
40 views

2d Array called into function. Why are 0's being inserted into the array while inside the function?

//prototype int draw(int board[d][d], int d); // draw the current state of the board. (Function call) board[d][d] = draw(board, d); //This is the function itself. int draw(int board[...
0
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0answers
46 views

Converting a 1D character array to a 2D array in random order.

I define my character array (9 items) as the following: char arr[] = {'a', 'c', 'b', 'z', 'k', 'l', 'j', 'o', 'd'} From this array, I would like to create a 3x3 array, in which the characters are ...
1
vote
1answer
19 views

How to map collection of unique large numbers to an array?

I have a list of unique 8 byte random ids and new ids are generated often. Let's say that the total number of ids can become at most N (let's say 100,000). Now, I want to map each of these ids to a ...
1
vote
1answer
78 views

How to combine N non-comparable arrays up to an output limit in a fair way?

Given N non-comparable arrays of different sizes, what is the best method to combine them into one output array? Since the input arrays are non-comparable, a metric is needed to represent how ...
-2
votes
0answers
49 views

Dotnet Core add Arraylist to Project [closed]

I just want to lern C# and need a ArrayList. First i add the System.Collections Package. But i can't find the ArrayList Class! Is there a package for the Arraylist in NuGet? And how is the easiest ...
2
votes
3answers
181 views

Why are arrays often treated as second-class citizens?

In many programming languages, arrays don't get as much attention as other data structures. In Java, there is no Array<T> type collection to make arrays feel more consistent, such as in ...
-3
votes
0answers
28 views

Parameter with Multidimensional array & params keyword

By using params keyword with 1D array in method declearation, we can pass variable number of arguments without populating arrays. Why it is compile time error when we use params keyword with ...
-1
votes
1answer
107 views

What is the proper or recommended way to save String[]'s, Array's, ArrayList's and int[]'s to Android?

I've looked up this question many many times but keep seeing different answers, what is the BEST way to save array's? It seems ludicrously infantile that there is no standard or easy way to save ...
-2
votes
0answers
52 views

Lib to convert XML to JSON and arrays as lossless as possible

I'm trying to work with some input that has mixed data, raw strings, XML and markdown, get it into a php array to do some calculations over it. Most calculations are statistical data with the words, ...
-2
votes
0answers
76 views

How can I place an SQL Server query result into an array and then extract specific values from the array in PHP?

I have an SQL Server database which runs the following query: SELECT t_Addresses.Coord_X, t_Addresses.Coord_Y, t_Addresses.Cust_ID INTO #temptable --Hash prefix specifies a temporary table FROM ...
6
votes
3answers
111 views

What is the origin of counting from zero in programming languages?

This is a question which I have wondered (and been asked) about for a long time. In (most? all?) programming languages, an index begins at zero for an array, string, etc. I recognize it became ...
-3
votes
1answer
98 views

How to compare and replace value from two object inside array?

Here i want to replace price in data1 to price from data2, and it updated if the id is same. Is it possible to do that without nested loop? var data1 = [{ "id": "56e641d4864e5b780bb992c6", ...
1
vote
4answers
214 views

Readability & Performance: Is it better to allow the Java garbage collector to clear a datastructure?

I work with large HashMap's and ArrayLists. When not needing them to be in memory any longer, I use myArray.clear(); to free up the memory. When my colleague saw that line, he changed it to myArray ...
-1
votes
1answer
77 views

Should I add 1 to my unknown string size when I create a char array to hold it via malloc? [closed]

When I have a string of unknown size and I create an char array to hold this string. I do something like this: #define LINE_END "\r\n" int line_end_size = strlen(LINE_END); char line[]="Hello! ...
4
votes
1answer
327 views

Why is Array.prototype designed to be a fully functional array?

In the below visualisation, There are two array objects(cars & bikes) that are created with below syntax, var cars = new Array("Saab", "Volvo", "BMW"); var bikes = ["Honda", "Yamaha"]; whose ...
-3
votes
1answer
125 views

Using System.out.println() with loops and arrays [closed]

Is there anyway I can create a loop for System.out.println("...") and reading in the values? For example I wish to do this: System.out.println("Input the Executive's name: "); String eName = ...
0
votes
0answers
54 views

Realizing pagination for merged array from multiple data sources (APIs)

I'm improving a WordPress theme with PHP. The theme contains a gallery section which loads data from the Flickr API. Now the client wants to display Flickr galleries as well as "local" galleries ...
1
vote
4answers
76 views

Obtaining lists from an array

Let's say my array contains integers. I'd like to create lists, so that every list contains indexes where a particular value occured in the array. For instance, if the array was 5,0,3,5,2,5,3, we ...
1
vote
0answers
82 views

Why my greedy algorithm not working for merge stone problem

Merge Stone Problem: You have n piles of stones in a line. For example, [4, 1, 2] means 3 piles of stone, the first pile has 4 stones, the second pile has 1 stone, and so on. You task is to merge ...
1
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1answer
330 views

What is the best approach to storing a multi-dimensional array with unknown bounds?

I'm trying to store content scraped from several lyric and chord websites into separate variables into either a multi-dimensional array, or into separate string arrays, but I've been stuck trying some ...
3
votes
5answers
323 views

What defines the dimensionality of an array?

I know that when we speak about an array having 1, 2, or 4 dimensions, we mean arrays like this: 1: [0] 2: [0,0] 3: [0,0,0] 4: [0,0,0,0] ... Is the first 'axis' of an array the only thing that ...
0
votes
1answer
133 views

How to save tuplas values, to later search on it

Scenario I have some values of the type : (Name - Email) From this couples of data, I have to set a ArrayList of "Name" values,something like: |Name1|Name2| --- |NameN| to set a Spinner. (Ordered ...
0
votes
1answer
122 views

Is there ever a reason to use variable variables in PHP rather than an array? [closed]

Is there any situation where an array is not suitable but a variable variable is? I cannot think of one or find one on any Stack Programmer Q&A. <?php $foo = array(); for($i = 0;$i < 3; $i+...
2
votes
2answers
198 views

Merge sort and O(n log n) mystery

I read every explanation here but still not convinced. I think mergesort is n * n and I know I am wrong but not sure where. Here is what I think: Suppose we are sorting 8 elements and this is the ...
0
votes
3answers
22k views

2 Dimensional Arrays in C++

I started learning arrays in C++ and came over a little side note in the book talking about 2D arrays in breif. I tested it out and i was amazed that it could give the programmer the ability to store ...
-1
votes
1answer
59 views

(Multidimensional array in C) How to make my output in a vertical position rather than in horizontal when the size of the array is n[3][4] [closed]

I would like to have some help. I must find a way that the output must be: A B C 90 60 80 50 100 70 100 20 100 10 50 75 Because the previous output is: A 90 50 100 10 B 60 100 ...
5
votes
2answers
180 views

How to store ordered information in a Relational Database

I am trying to understand how to properly store ordered information in a relational database. An example: Say I have a Playlist, consisting of Songs. Inside my Relational Database, I have a table of ...
1
vote
2answers
277 views

Non-fixed-size Fenwick Tree implementation

I'm planning to implement a non-fixed-size Fenwick tree. That is, a Fenwick tree that allows interleaving range queries with adding/removing elements. All implementations and samples I've seen so far ...
-1
votes
1answer
174 views

eradicating the array = loop mindset [closed]

I have noticed a common issue in code reviews, that takes this form: // "arr" is an array for (i = 0; i < arr.length; ++i) { if (i == 3) { // do something with arr[i] } if (i ==...
2
votes
1answer
341 views

Beginners C# question about Array.Reverse

I am sitting through a very well-explained and thorough video tutorial series, using Visual Studio 2012 as my developing environment. Anyway, one thing that is hard to figure out is this. Say you ...
1
vote
1answer
918 views

ruby-idiomatic hashes vs arrays

So I am still fairly new to ruby, though I have noticed that it is very hard to create 2d-array and that hashes seem to be more of the go to data structure than arrays. I was wondering why the Ruby ...
2
votes
3answers
323 views

Is it a good idea to modify the array keys in foreach

Some times I need to modify an array key for example something like: $temp = array(); foreach($arrayIWantToModify as $key => $value) { if($value % 2) == 0) { $temp['odd_' . $key] = $...
14
votes
1answer
3k views

PHP: when to use arrays, and when to use objects for mostly-data-storing code constructs?

PHP is a mixed paradigm language, allowing to use and return non-object data types, such as arrays. I pose a question to try to clarify some guidelines for selection of arrays vs objects when deciding ...
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votes
2answers
196 views

3D array updating in C# [closed]

I'm curious because I have read that once an array is declared it can not be changed. Maybe if I lay out my thoughts. Say, I have a cube with dimensions 5x5x5 and I have a viewport that can rotate ...
21
votes
5answers
9k views

What's the use of .Any() in a C# List<>?

I've been discussing this with colleagues, and we couldn't figure out what the use is of .Any for any given List<>, in C#. You can check the validity of an element in the array like the ...
31
votes
6answers
141k views

Is initializing a char[] with a string literal bad practice?

I was reading a thread titled "strlen vs sizeof" on CodeGuru, and one of the replies states that "it's anyways [sic] bad practice to initialie [sic] a char array with a string literal." Is this true,...
0
votes
0answers
40 views

Is it better to store integer data or array references in a javascript visualization?

Say I have a tree that I'd like to visualize with d3. Nodes have various attributes produced by the d3 library, attributes like an index and position variables. Now, I could add more attributes to ...
0
votes
0answers
62 views

Microcontroller oLED Display Buffering Optimizations or Alternatives For Speed?

I'm developing a UI/Layout for a 128 x 64 oLED Monochrome Pixel Display. I've got a small netMF microcontroller driving the display via SPI at 40mhz. I'm using some basic methods, like these here, to ...
1
vote
0answers
267 views

Why is deep plucking a bad idea?

Both underscore and lodash refuse to implement deep plucking, despite many requests from users and gists or modules that implement the feature. _([{o:{a:1}},{o:{a:43}},{o:{a:234}},{o:{a:23}}]).pluck("...
3
votes
1answer
761 views

sort multidimensional array recursively - is this reasonable

In a nutshell, I needed to traverse any number of dimensions of a multidimensional array (or not) and I wanted the process to be as predictable as possible (in order to proliferate the pattern ...
1
vote
2answers
1k views

Why a hashtable? Why not just a non-hashed associative array?

I've been learning about using a hashtable to efficiently check for items in a list without looping through the whole thing, but there's one thing that I don't get: Why hashed keys? It seems like: ...
13
votes
1answer
447 views

Why using sizeof of type to calculate the number of elements in an array is considered inferior to using sizeof of an element?

I'm reading "King K.N's C programming" and I'm reading the following statement: We discussed using the expression sizeof(a)/sizeof(a[0]) to calculate the number of elements in an array. The ...
3
votes
2answers
101 views

Reducing a sequence of array modification operations (insert, sort, replace, remove)

Given a plain array of values, e.g. ["Apple", "Orange", "Banana", "Strawberry"] and a list of operations from the set of [insert, delete, sort and replace], e.g. [ {cmd: "insert", index: 2, ...
2
votes
2answers
166 views

How to create a 2D array at runtime in Ada? [closed]

In Ada programming, What is a best practice way to create a 2D array of a size that is specified by the user? I'm teaching myself Ada for work (after many years of C programming), and I'm having ...
1
vote
2answers
231 views

What is the algorithmic time complexity of this program?

I wrote a simple program in java to create and maintain Dynamic Arrays: public class DynamicArrays { private Integer[] input = new Integer[1]; private Integer length = 0; private Integer ...
2
votes
2answers
354 views

Find the maximum number of pairs of numbers that are in a range, between two arrays

Lets say I have two arrays A and B A = {1,2,3} B = {12,11,67} and have max sum value S = 10 How many maximum number of unique pairs can be formed between the two arrays who's sum is less than or ...
5
votes
3answers
591 views

@SuppressWarnings in generic array declaration

While doing a coding test, I ran into a problem where I need to initialize an array of generic type in Java. While trying to figure out how to do that, I looked at this Stack Overflow question and it ...
4
votes
5answers
7k views

Retrieving maximum value from a range in unsorted array

I have an unsorted array. I have queries in which I give a range and then the maximum value from that range has to returned. For example: array[]={23,17,9,45,78,2,4,6,90,1}; query(both inclusive): 2 ...
14
votes
2answers
37k views

Should I use a list or an array?

I'm working on a windows form to calculate UPC for item numbers. I successfully create one that will handle one item number/UPC at a time, now I want to expand and do it for multiple item numbers/...