What "mistake" are you seeing? Remember that Stack Overflow is where programmers can come for help with their problems. Expect the questions to have mistakes. If all the code samples were perfect, what would be the point of this website? — Jacob Lee 24 secs ago

That is some high-brow math indeed. The folks over in the math stackexchange should be better suited for this task. But if you're willing to bear with us programmers and dumb the problem down some more, I think we'd be able to work something out :^) From what I've gathered, your function needs very large i to approximate tau; so you'd need tail-recursive functions at the very least. Unfortunately, MATLAB doesn't seem to support tail-recursion, so you'd likely have to make this an iterative function if you want MATLAB. — mimocha 46 secs ago

Note also that your code doesn't use the typical naming conventions. Earmuffs (asterisks around the name: *foo*) should only be used for special variables (i.e. ones defined with defparameter or defvar), not function names. Lisp programmers also use dashes instead of camel/snake case (*NextRoom* -> next-room, *dice_combat* -> dice-combat). Even if you for some reason decide to deviate from that, you should at least pick just one convention to use. — jkiiski 36 secs ago

That is not a question related to code written on which you need the help of other programmers to get it working. For that reason the question is clearly off-topic for Stack Overflow and should be deleted by you as soon as possible. Right click on svchost.exe in C:\Windows\System32 and click in opened context menu on Properties. You see as description for this executable: Host Process for Windows Services. So this executable is responsible for starting and running Windows services. — Mofi 57 secs ago

Welcome to Stack Overflow. Please read the About and How to Ask pages. No, we won't write the code for you. We will help you resolve problems in an honest attempt to code a solution to the task, but we won't simply write the code for you. See also An open letter to students with homework problems on Software Engineering SE. — Jonathan Leffler 27 secs ago

I would add that creating mutable global state like this is probably not a good idea. — JonasH 15 secs ago

Actually am just feeling my software engineer application, am just stack somewhere. am on LINUX, I started with ssh, uname, man, pwd, ls, cd, less, touch, cp, mv, that's where am stack. i created an empty file named "hello_world" with touch, then i was asked to copy the file "hello_world " — Alflix Media 26 secs ago

A string literal is supposed to read only (depending on the architecture) so returning it via a non-const pointer means that the caller may write to it, which is undefined behavior: softwareengineering.stackexchange.com/questions/294748/… — Devolus 25 secs ago

sorry, but SO isnt the place to ask others to write code for you. I wouldnt do that even if we met in real. I would ask you to write the code and ask questions when you got stuck. What this exercise is trying to teach you is how you can manage to come up with a solution. Once you have a solution (written by someone else), the exercise is useless and you can turn to the next one. Don't get me wrong, but we don't need another implementation of a Triangle, but we need programmers that know how to write one. — largest_prime_is_463035818 32 secs ago

This question might better suit softwareengineering.stackexchange.com. — sp00m 33 secs ago

@shevron impossible is a dumb word! Mostly in computer world where programmers are often called wizard! — F. Hauri just now

The only SE sites I know that entertain recommendations are Software Recommendations and Hardware Recommendations. — Ron Maupin 58 secs ago

This is a very broad question with no "one answer"... As programmers, we are always in a balancing game. The "ideal" solution is always dependant on context. Having said that, the first patterns that come to mind for me that you might want to study for "managing structural complexity" are Builder, Bridge, and maybe Prototype. I recommend sourcemaking.com/design_patterns, as they do a good job of providing meaningful examples. On another note, IDevice seems too "wide" to me. Are these devices doing exactly the same thing? Can the interface be broken down further? — Alexandru Clonțea just now

@kevinnls FYI, i have asked this question on the software engineering SE. — Zilog80 1 min ago

@flywell If you know the type of the response, put it in your method signature. It will provide compiler checking that you're returning what you expect, and it will help future programmers (you) understand the expected behavior of the controller. — chrylis -cautiouslyoptimistic- 28 secs ago

Welcome to Stack Overflow! Please take the tour, read what's on-topic here, How to Ask, and the question checklist, and provide a minimal reproducible example. "Implement this feature for me" is off-topic for this site. You have to make an honest attempt, and then ask a specific question about your algorithm or technique. How do I ask and answer homework questions? | Open letter to students with homework problems — Pranav Hosangadi 21 secs ago

Please carefully read this. It explains why questions like this one aren't suitable for this platform, and why asking for the answer in this manner is actively detrimental to your learning. — nanofarad 43 secs ago

Questions asking us to recommend third party libraries/software aren't on topic, sorry.. For that ind of research you might get an answer at softwarerecs.stackexchange.com — Caius Jard 27 secs ago

Welcome to Stack Overflow. SO is a question and answer page for professional and enthusiast programmers. Please add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself. — Cyrus 30 secs ago

There are sites on the Internet where you can contract programmers for short jobs. SO is not such a site. — Shadow 59 secs ago

The friendly programmers of Stack Overflow are unable to divine the error you encountered unless you tell us what it is! In the absence of more information such as the actual error, we have no idea what to do either. Please take the tour, read what's on-topic here, How to Ask, and the question checklist. Welcome to Stack Overflow! — Pranav Hosangadi 57 secs ago

Welcome to Stack Overflow. Please take the tour to learn how Stack Overflow works and read How to Ask on how to improve the quality of your question. Then check the help center to see what questions you can ask. Please see: Why is “Is it possible to…” a poorly worded question? (don't just change your question to "How"). Please show your attempts you have tried and the problems/error messages you get from your attempts. — Progman 22 secs ago

Imagine you're a compiler, what would you do ? Now imagine you're a compiler, smarter than you, and you have the experience of thousands of bearded programmers ? — Denys Séguret 28 secs ago

Welcome to Stack Overflow. Please take the tour to learn how Stack Overflow works and read How to Ask on how to improve the quality of your question. Then edit your question to include the full source code you have as a minimal reproducible example, which can be tested by others. Please see: Why is “Is it possible to…” a poorly worded question? (don't just change your question to "How"). — Progman 37 secs ago

Just like taxi drivers don't drive blindfolded, programmers don't code without a debugger. So if you don't know how to use a debugger, then now is the time to learn. — Lundin 36 secs ago

Welcome to Stack Overflow! How to ask homework question and Open letter to students with homework problems — Barmar 32 secs ago

How to ask homework question and Open letter to students with homework problems — Barmar 15 secs ago

Also, please read How do I ask and answer homework questions? and Open letter to students with homework problems You copied your current code from somewhere. You'll copy the solution to your question from the answers you receive here. You're doing your own education a disservice. Programming is not a copy-paste job. "Implement this feature for me" is off-topic for this site. You have to make an honest attempt, and then ask a specific question about your algorithm or technique. — Pranav Hosangadi 42 secs ago

We're programmers, we can read. Please read about why you shouldn’t upload images of code or errors when asking a question and how to create a minimal, reproducible example — biesior 54 secs ago