Questions tagged [programming-logic]
According to Wikipedia, Logic (from the Ancient Greek: λογική, logike)[1] has two meanings: first, it describes the use of valid reasoning in some activity; second, it names the normative study of reasoning or a branch thereof.[2][3] In the latter sense, it features most prominently in the subjects of philosophy, mathematics, and computer science.
60 questions
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How can I code synchronous programs in Node?
I'm a career programmer, very comfortable writing programs in Python, and recently started learning Node.
I understand the asynchronous features are useful in many situations, but when I debug my code,...
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3
answers
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Is there an approach to keep a large number of conditionals maintainable
I work on a survey that has a lot of questions. This means we have a lot of columns/variables to work with. This translates to a lot of conditionals that have to be done a certain way according to a ...
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Drawing UML Activity Diagram - Fetching data decision logic
I have a function to fetch data from remote API and store it in local database. Its logic is:
Is network available, if yes proceed to next step, if no show
error massage.
Is app launched for first ...
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vote
1
answer
161
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Ranking results from a Question and Answer game
I have a question and answer trivia game app which randomly picks questions from a database and prompts the user to answer the question correctly. The total number of correct answers, the total number ...
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Refactoring nested if-else interface method in Java8
I have the below default method in an interface and it seems to be pretty complex because of the many if-else conditions.
default void validate() {
Application application = application().get();
...
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Is there a better way to write the logic for handling "close plus open" and "partially close" trades?
I am writing a paper trading system, and what I have works, but I can't help but feel that there's a better way to partially close a stock position; what I currently have seems a little overboard.
...
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Design of dropdown lists to handle optional selection
Consider the following example in a CRUD application. A user can select their favourite food from a dropdown list ("Burgers", "Pies", "Chips"). This is an optional field i.e. not mandatory. Thus a ...
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What is the logic in the order of operator precedence? [closed]
Absolutely academic context question-
I found countless articles listing the order of operator precedence in all languages, but what is the logical reasoning behind that specific order?
For clarity ...
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Logic circuit simulation: homebrew or third party solution?
Software I'm working on requires simulation of logic circuits, both combination and sequential.
Now the simulation doesn't need to be too detailed, in fact it could be detrimental to the function of ...
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How to avoid logical mistakes in code, when TDD didn't help?
I was recently writing a small piece of code which would indicate in a human-friendly way how old an event is. For instance, it could indicate that the event happened “Three weeks ago” or “A month ago”...
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Do i need 2 tables to book entity?
I am developing a website to store books info such (title, book_no, author, edition, container...). I have two types of insert
insert series of books (Eg: harry porter series: chapter 1, 2,3...)
...
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Passing 0's (literals) to a constructor
I have a function that creates a new object by passing to it's constructor integer ids primarily with values of 0. This function is called when saving a newly created record (not an edit).
public ...
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Understanding LSB and MSB
In reference to one interface control document, I found difficulty in understanding this concept. There is one parameter having LSB of 0.0625 and MSB of 2048 that should be transmitted from one piece ...
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3
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Is there a way to have four possible outcomes without repeating the two conditions? [duplicate]
In a generic sense, my question goes something like this:
if (p) {
if (q) {
a();
} else {
b();
}
} else {
if (q) {
c();
} else {
d();
}
}
There ...
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What is the best practice around De Morgan's Law [closed]
We all know De Morgan's Laws
!(a && b) === (!a || !b)
!(a || b) === (!a && !b)
Is there a community consensus around which one of these representations is easier to reason about (and ...
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For which built-in C++ type is the law of excluded middle violated?
Apparently, for some built-in type of C++, the following does not hold: a==b || a!=b
Which type/value is it?
The question is originally from
this video:
https://www.youtube.com/watch?v=etZgaSjzqlU&...
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share method logic along classes without inheriting from abstract class
In some languages (e.g. C#) a class can only ever have 1 base class which seems like a problem for what I'm trying to do. I will give you an example of what i'm trying to do, hopefully this will make ...
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How to translate business requirements/logic into code?
I'm new to programming and I'm trying to develop a template of questions I can apply to business rules that will help me extract what's needed to begin coding.
Do programmers have a set of ...
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3
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What's a good way to extract what's needed programatically from business logic? [closed]
I'm new to programming and I've discovered something that causes me confusion and frustration: Translating business logic into actual code. I'm trying to develop a set of questions I can ask myself ...
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Finding the minimum transaction
Given a list of transactions like:
A -> 10 to B
B -> 10 to C
The naive way to settle the transaction would be:
C owes 10 to B
B owes 10 to A
But the same transaction could be settled by:
C ...
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Parallel vs Simple Assignment question
I'm quite new to Python and learning it on Lynda.com, which does not seem to have any way to ask questions about lesson content. In a video about while loops there is this code:
a, b = 0, 1
while b &...
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Where do we need to include non business logic validations in Service Layer
Currently um working in an application and it has the following hierarchy
WEB API2 Controllers (hilds the end points)
Business Logic Layer (Dedicated for business logic handling )
Data Access Layer ...
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Sudoku Solver BackTracking vs Simulated Annealing
Before you read any further, assume you know what sudoku game and how to go about solving it.
So I have created a sudoku solver with brute-force:
The algorithm goes as
calculate(through an simple ...
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6
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Business logic: Database vs code [duplicate]
I'm a student of systems engineering, and all my teachers and friends (that actually work in the area) say that it is better to have as much logic as possible implemented in the database (queries, ...
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0
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Best way to structure a complicated web-based quiz [closed]
I have a web project that requires I build a quiz and am having some difficulty working out how to efficiently code it. I'd like to create some sort of json template system so that the quizzes can be ...
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2
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Upgrade and downgrade customers subscription
I have been stuck at a requirement for way too long too handle it :(.
Our company is having increased number of customers who wants to upgrade or downgrade their subscription. For now, the ...
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2
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Refactoring wordy conditional tests [duplicate]
My first attempt at this question was too theoretical, so I've rewritten it with actual code. See the edit history if you care.
Supposing this logic, "suffering" from the arrow anti-pattern:
/**
* ...
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Good way to program an orchestration / processflow
I'm programming a process in which clients will be separated in 3 different groups, and for every group a different action will be performed.
My question concerns the process of deciding which client ...
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How can I Identify which condition satisfied the if statement? [closed]
Suppose, I am using a if statement as such:
if(A || B || C || D)
{
echo "Hurrah! if is satisfied!";
echo "But! How can I know which was true of the 4 (A,B,C,D)";
}
Is there any way I can know ...
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Creating algorithms [closed]
I am a relatively new programmer. I can pick up languages and learn syntax at a speed that I consider good, but I can't figure out how to solve problems logically using algorithms very well. I know ...
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Efficient ordering of objects online
I have a list with objects stored in a database. These objects are shown in a list and the user can drag and drop them to order them in a specific way. I want that specific order to be stored.
How ...
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How to display an inward spiral matrix
Suppose I have the following matrix with values 1-25 as input to my program.
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25
The inward spiral should give me the output 13 ...
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How to define "or" logically
Recently, I came across a problem that required me to define the logical "OR" operator programmatically, but without using the operator itself.
What I came up with is this:
OR(arg1, arg2)
if arg1 = ...
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Given a number X, how do I find from an array of numbers, a unique combination that adds up to X and has the lowest sum of squares?
Given the number 15 and the array [1, 2, 3, 4, 5, 6]
Possible combinations (sum=15) would be:
[1, 2, 3, 4, 5]
[2, 3, 4, 6]
[1, 3, 5, 6]
[4, 5, 6]
Their respective sum of squares would be:
55, 65, 71 ...
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3
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Are functional languages a kind of program derivation?
Program derivation is defined as the derivation of a program from it's specifications. Usually this specification language is some form of propositional logic, but from what I understand, it need not ...
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How to guarantee invariants / Inner logic in setter methods
According to DDD-principles I use factory-methods to create consistent objects and to ensure that the objects are in the right state.
Now I'm in doubt about inner logic of setter methods. I'm tied up ...
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Making server logic independent of client interaction
I'm trying to make a realtime multiplayer web-game in node.js with express framework and socket.io library.
But I can't seem to make my server-side logic independent of client interactions.
I want ...
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Implementing bussiness logic with a large number of business rules and processes
We are currently working on a project that heavily relies on a database.
Among many tables the main focus is on table "data" which is linked to another table "data_type" as many-to-one, which is then ...
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Ordering if conditions for efficiency and clean code [closed]
This is purely a design question and the example is simple to illustrate what I am asking and there are too many permutations of more complex code to provide examples that would cover the topic. I am ...
user208372
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Is there any reason zero should still equal false in a new programming language? [duplicate]
I understand that 0 is false because math established that a long time ago and C established it in the programming world, as talked about here. However, other than following established conventions, ...
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Finding an object on an infinite line
Question:
There is an infinite line. You are standing at a particular point you can either move 1 step forward or 1 step backward. You have to search for an object in that infinite line. Your object ...
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Handling subscriptions, balances and pricing plan changes [closed]
Preamble
My aim is to create reusable code for multiple projects (and also publish it on github) to manage subscriptions. I know about stripe and recurring billing providers, but that's not what this ...
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Good Data Structure book to improve programming logic for children [closed]
My cousin (Age 10) who studies in Standard 5. He wants to learn programming and programming logic.
Which book or resources should I refer? Is there any Good Data Structure book to improve ...
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Is it reasonable to use Javascript MVC Frameworks for closed source paid web applications? [closed]
I am wondering if it is reasonable to write closed source, paid web apps in Javascript (JS MVC Frameworks like AngularJS, Backbone, Knockout, ...)? I'm concerned because in this type of frameworks you ...
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How to unit test code which is intended to have different results on different platforms
I noticed some duplicate code in a codebase I am working on that appended a filename to a directory path, so I decided to refactor it into its own method. The application I am working on is not well ...
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Flow Chart - While Loops process
I'm having difficulties understanding whether or not this is the right process to use for a flow chart which illustrates the processes involved in an algorithm.
For this, assume the following:
A 1D ...
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Best Traversing Strategy / Logic Help Needed
Background: Here is the scenario, imagine I have a little Robot. I give this robot a Map, and I want him to traverse the map, after doing so, I want the Robot to tell me the shortest possible path on ...
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Is the separation of program logic and presentation layer going too far?
In a Drupal programming guide, I noticed this sentence:
The theme hook receives the total number of votes and the number of votes for just that item, but the template wants to display a percentage. ...
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3
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Should I use AND or should I use OR [closed]
An order can be in the "status" of Completed, Corrected or some other status.
I saw some code that is checking it like this, the purpose is to disable some stuff when the status is in Completed or ...
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Is saying "if ( $a != null && $a == 5)" the same as "if ($a == 5)"
First off, sorry if this is answered somewhere else. I did a brief search, but wasn't sure how to ask in search terms.
I'm looking at some code and came across lot's of statements like this:
if ( ($...
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