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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
71%
+3 −0
Transferring files from a legacy project to an existing one as varbinary

Our team is currently transferring all functionality (+ some changes) from small and very old project A (almost code freeze) to project B (actively developed). As part of the data migration, there ...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

81%
+7 −0
Conditionally ignore files in git

I'm using git for LaTeX projects and am in a little dilemma about how to best ignore files. if I add *.pdf to my .gitignore file, I keep forgetting to force add included graphics if I don...

3 answers  ·  posted 2y ago by samcarter‭  ·  last activity 2y ago by Peter Taylor‭

86%
+11 −0
What is malloc's standard-defined behavior with respect to the amount of memory it allocates?

I recently told a friend that malloc(n) allocates and returns a pointer to a block of at least N bytes of memory, as opposed to exactly N; that it is allowed to allocate 'extra' memory to meet e.g....

2 answers  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by bta‭

33%
+1 −4
How can I modify the code above to accept string as user input and use strcmp to compare with the contents of the text file & then delete that line?

I want to enter a string to compare with the text file, and if that word matches, then I want to delete that line containing that string. How can I modify the code below, since the code below take...

1 answer  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by Alexei‭

84%
+9 −0
Open file in script's own folder

I have a Python script that needs to access some data (or configuration) file in its very own folder. For example, say script.py does something like this: with open('data.txt') as file: data ...

2 answers  ·  posted 2y ago by J-hen‭  ·  last activity 3mo ago by Karl Knechtel‭

50%
+1 −1
iframe tag is vertically scrollable although I would expect it to vertically stretch 100%

I have an iframe tag to which I didn't set height so it has a default height which is 150px (at least in Google Chrome). As a consequence, the iframe appears partially in such a way that constant ...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by deleted user

62%
+3 −1
Comparing two excel files with Python based on changes

I have two tables: Table1: Name Description Amount 123 Description123 123 456 Description456 456 789 Description789 666 101 Description777 101 133 De...

1 answer  ·  posted 2y ago by sfrow‭  ·  last activity 2y ago by ibmx‭

57%
+2 −1
width="100%" for an iframe, breaks responsiveness CSS directives

In a MediaWiki website I embed a PHP file containing a contact form via <iframe> with the following attribute pattern: width="100%" frameBorder="0" My problem I need the iframe to stre...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

84%
+9 −0
Behavior of Pointer Arithmetic on the Stack

Consider the following code: #include <stdio.h> int main() { int a = 5; int b; ++*(&b + 1); printf("%d\n", a); return 0; } The output is as expected: 6 ...

4 answers  ·  posted 2y ago by Josh Hyatt‭  ·  last activity 2y ago by Alexei‭

40%
+2 −4
Problems with data structures and filestreams.

So I just started learning how to use file-streams in C & decided to attempt a question which is to do with library management in C, however I am currently encountering some problems and feel l...

2 answers  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by Alexei‭

23%
+1 −8
How to efficiently remove every occurrence of one string inside another

I have two strings and want to remove every occurrence of the second string inside the first one starting from the beginning of the first string and as if each occurrence was removed immediately. ...

1 answer  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by __blackjack__‭

75%
+4 −0
How to clear the contents of a file?

How to clear the contents of a file using C?

1 answer  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by hkotsubo‭

25%
+0 −4
Ajax pattern to send email with a backend file to store an email address

I use the following backend (PHP) pattern to send email. I consider to start sending email by Ajax but I would still need to store my email address in some backend file (say, a PHP file) so it won...

0 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

55%
+3 −2
Uncaught TypeError: Failed to construct 'FormData' [closed]

I am trying to submit a form with Ajax from a well-configured shared hosting environment. Emails don't arrive to my email client although I have already sent emails without Ajax from this environm...

1 answer  ·  posted 2y ago by deleted user  ·  closed 2y ago by Alexei‭

71%
+3 −0
Disable import of Android SDK/Support Libraries

I am trying to re-build an unpacked apk, because it was unpacked the required libraries are already included, deleting the prepacked libraries would be feasible if it weren't for the fact that some...

0 answers  ·  posted 2y ago by Aidan‭

37%
+1 −3
How can I delete a book from the collection by a particular title from my library file?

I would like to delete a book from the collection by a particular title from my library if the user enters 2 as input for my switch statement. How can I do that with my current code? #include<...

0 answers  ·  posted 2y ago by hamburgersarecool‭  ·  edited 2y ago by hamburgersarecool‭

37%
+1 −3
Regarding the heap sort algorithm.

I get the concept of the heap sort algorithm and its like first you have a heap(ordered binary tree) then we have the Max heap which has the highest element value in the array at the top of the tre...

1 answer  ·  posted 2y ago by hamburgersarecool‭  ·  edited 2y ago by Alexei‭

77%
+5 −0
Dealing with GETs with long query strings in ASP.NET Core

One of the recent business requirements is to be able to search through a list of entities using a bunch of filters. Most of these filters allow multiple values and the user might theoretically pro...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

28%
+0 −3
Data structure implementation with Linked lists.

Could someone explain this part of the coding for data structures & linked list? I actually got this code from a textbook but no matter how I read the textbook, I still don't get the concept &a...

1 answer  ·  posted 2y ago by hamburgersarecool‭  ·  last activity 2y ago by Alexei‭

50%
+2 −2
How can you modify your server code to make it accept any port numbers instead of just one which is the one you predefined?

Is there any way where I can modify the original server code so that it accepts any port number instead of the predefined one (i.e., port number 8989)? Port number will be entered in the command li...

0 answers  ·  posted 2y ago by hamburgersarecool‭  ·  edited 2y ago by Alexei‭

33%
+2 −6
Regarding the implementation of data structures.

I'm attempting a question to do with data structures, file streams & linked lists. The code isn't complete yet as I am still halfway working on it. I am required to use data structures in the d...

1 answer  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by Alexei‭

55%
+3 −2
Why does fopen return NULL?

#include<stdio.h> #include<stdlib.h> int main (void){ FILE *cfPtr; char name[15]; int ID; if ((cfPtr = fopen("draft.txt","w")) == NULL){ printf("File could n...

2 answers  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by dumplings‭

37%
+1 −3
How to submit form data with Ajax?

I need to apply backend behavior (PHP directives in my case) to an HTML <form>. The backend behavior I wish to apply to the form is in this pattern (behavior.php): <?php $name = $_POST...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by r~~‭

25%
+0 −4
What does the greater than 0 indicate in the case of this statement 'if (compare(A[j], A[j+1]) > 0)' ? Thank you.

Question: There is a list of integers in an array (3,2,1,5,6,4), sort this list in both ASCENDING & DESCENDING order. Create a sort function. #include<stdio.h> #include<stdlib.h> ...

1 answer  ·  posted 2y ago by dumplings‭  ·  last activity 2y ago by Lundin‭

70%
+5 −1
What does a variable followed by parentheses ("ptr()") mean?

What does ptr() mean in this code? #include<stdio.h> #include<stdlib.h> void PrintHello() { printf("Hello\n"); } int Add(int a, int b) { return a+b; } int main...

2 answers  ·  posted 2y ago by dumplings‭  ·  last activity 2y ago by Martin Bonner‭

66%
+4 −1
Invalid memory access when trying to dereference a pointer obtained through a function call

Hey, regarding a question on returning pointers as functions, why does my code produce this error & won't print out the sum = 6? #include<stdio.h> #include<stdlib.h> int *A...

1 answer  ·  posted 2y ago by dumplings‭  ·  last activity 2y ago by celtschk‭

71%
+3 −0
Hash sign as a path component in a user script's @match command prevents the script from running

I try to exactly match a login page in a website, for a user script manager (USM) script, which I run with Tampermonkey. This pattern didn't work: // @match https://example.com/#/login ...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

50%
+1 −1
How to fire the change event for an input field?

I have added some input to an input field element this way: const inputFiled = document.querySelector("#example"); inputField.value = "X"; I want to fire a change event for that field right af...

2 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

87%
+12 −0
What does the static keyword do in C?

What exactly does the static keyword do in C? I have seen it used in several diverse contexts: 1) As a variable outside a function: #include <stdio.h> static int x = 5; int main (void) ...

1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 12mo ago by Lundin‭

77%
+5 −0
Handling high frequency requests with cancellations in an ASP.NET Core application

Issue I have recently discussed with a friend a performance issue he and his colleagues have encountered in an ASP.NET Core 5 application (a checkout app, microservices architecture). The problem...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

28%
+0 −3
Why would a form value inserted with value property won't be effective? [closed]

In a website I didn't build, I want to put a value in an HTML input field element with JavaScript and to also use it as-putted. I can put it with the browser console this way: document.querySelec...

1 answer  ·  posted 2y ago by deleted user  ·  closed 2y ago by Alexei‭

71%
+3 −0
document.open() and the DOM tree of the loaded (closed) browser window on which it works

If I execute in browser console: document.write("Hello"); A new DOM document with the text Hello appears in the same browser window. From MDN documentation: Note: Because document.write() w...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

25%
+0 −4
What is the difference between a decoupled, Headless and RESTful content management system?

By means of content management system architecture, Is the implementation of decoupling architecture (backend and frontend separation), headless architecture and Representational State Transfer (R...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Canina‭

75%
+4 −0
How to align my content to the left?

This revolves around images. I'm trying to write an HTML page of COVID-19 safety procedures, and here's what I've written so far: <!DOCTYPE html> <html> <head> <title&...

2 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 8mo ago by Peter Taylor‭

66%
+2 −0
Understanding createTreeWalker method in the context of replacing strings (or parts of them)

I want to ensure I understand the following code; credit to user:m3g4p0p on Sitepoint, for this code: const walker = document.createTreeWalker( document.body, NodeFilter.SHOW_TEXT ) let...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by hkotsubo‭

88%
+14 −0
Why are list comprehensions written differently if you use `else`?

The following list comprehension worked when I tried it: [num for num in hand if num != 11] But this doesn't work: [num for num in hand if num != 11 else 22] It gives a SyntaxError, highlightin...

2 answers  ·  posted 2y ago by true_blue‭  ·  last activity 5mo ago by Karl Knechtel‭

66%
+2 −0
How do I remove the column options menu from an embedded Look?

I have a Looker table look displayed to users using SSO embedding in an iframe. When displayed to users, the users can access the column options menu via a cog-wheel dropdown. In Admin > Platfo...

0 answers  ·  posted 2y ago by Sigma‭

75%
+4 −0
Add single element for multiple keys to map

I have a map and a new item to add to the map and a list of keys I want to attach the new item to: => m1 {:a 1 :b 2} => itm 3 => ks [:c :d :e] => m2 {:a 1 :b 2 :c 3 :d 3 :e 3} ...

2 answers  ·  posted 2y ago by NoahTheDuke‭  ·  edited 2y ago by Alexei‭

77%
+5 −0
Common string handling pitfalls in C programming

Preface: This is a self-answered Q&A meant as a C string handling FAQ. It will ask several question at once which isn't ideal, but they are all closely related and I'd rather not fragment the p...

1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Lundin‭

57%
+2 −1
Change font-family with JavaScript

I want to change the font-family of all elements in a document with JavaScript. I have tried this: document.querySelectorAll("body").forEach( (e)=>{ e.style.fontFamily = "arial"; }); ...

2 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

50%
+1 −1
How to grant privileges to a user on a database specifically (i.e. not globally) in PHPMyAdmin?

In PHPMyAdmin 5.1.1 I have created a user account and a database with the same name and granted all privileges to the user on that database. I have exported the database to a backup file, deleted ...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by deleted user

71%
+3 −0
Docutils rst2pseudoxml.py reported error: No role entry for "meth"

docutils's rst2pseudoxml.py is reporting this error: Unknown interpreted text role "meth". even though the build command: sphinx-build -b html -d build/doctrees source build/html runs fine and pro...

1 answer  ·  posted 2y ago by CodeFarmer‭  ·  last activity 2y ago by J-hen‭

57%
+2 −1
Fixing vertical discrepancies with CSS

I have a "Our menu" webpage automatically created with Drupal 9 Views module which presents a miniature version of each menu dish webpage in that "Our menu" webpage (illustration image below). My ...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

62%
+3 −1
Python looping 300 000 rows

Based on my last question comes new one. How to loop over 300 000 rows and edit each row string one by one? I have a list of 11-digit numbers stored in one single column in Excel, and I need to s...

1 answer  ·  posted 2y ago by sfrow‭  ·  last activity 2y ago by NoahTheDuke‭

60%
+4 −2
Separate digits of a number in groups with different sizes

I have a list of 11-digit numbers stored in one single column in Excel, and I need to separate the digits according to this pattern: 2-2-1-3-3. Example: 00002451018 becomes 00 00 2 451 018. How c...

2 answers  ·  posted 2y ago by sfrow‭  ·  edited 2y ago by Alexei‭

50%
+0 −0
How to to make a store tree view cart

I am building an MVC cart system. I have the MERCHANTS table and the PRODUCTS table. A merchant (store) can have one or more products, everything works fine but what I want is to display products b...

0 answers  ·  posted 2y ago by Fyoni‭  ·  edited 2y ago by Alexei‭

87%
+12 −0
How do I support tab completion in a python CLI program?

I spend a lot of time writing CLI tools in Python, and I would like to support tab-completion in a style similar to Git. For example, subcommands should be tab-completable, options should expand ba...

1 answer  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by hkotsubo‭

90%
+17 −0
What is the purpose of `if __name__ == '__main__'`?

I often see the construct if __name__ == '__main__' in Python code. For example, the queens.py demo in the Python repository ends with these two lines: if __name__ == "__main__": main() Ho...

1 answer  ·  posted 2y ago by J-hen‭  ·  last activity 2y ago by hkotsubo‭

84%
+9 −0
Is it dangerous to use json.loads on untrusted data?

I manage a wsgi application that accepts JSON data via POST from potentially untrusted sources. Normally it is treated as a text blob and never parsed, but there is a value in the expected input th...

1 answer  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by hkotsubo‭

75%
+4 −0
What are the disadvantages of using SQL Server Replication - Transactional Replication type?

The context A reports related process is directly reading the production operational database once about two hours. This involves reading all the data from some 70 tables which takes a couple minu...

0 answers  ·  posted 2y ago by Alexei‭