See How do I ask and answer homework questions? and Open letter to students with homework problems — Michael M. 1 min ago

Please edit your question to show what you have tried so far, and what specific problem you need help with. See the stackoverflow.com/help/how-to-ask page for details on how to best help us help you. In addition, you can follow the guidance on creating a minimal, reproducible example stackoverflow.com/help/minimal-reproducible-example Finally, you can refer to meta.stackoverflow.com/questions/334822/… and softwareengineering.meta.stackexchange.com/questions/6166/… — Carewen 43 secs ago

What lines? I only see a bunch of numbers and some names. Even if your question was more clear, this isn't a code writing service. Stack Overflow is a site focused on collecting interesting questions and answers that programmers with at least a little experience will find useful. The site doesn't exist to teach you rudimentary programming. What you're talking about is the most absolutely basic level of programming. Get a book on Python, or go through one or two of the dozens of Python tutorials on the net. Come back here when you've got a specific question about your code. — CryptoFool 39 secs ago

The poster provided insufficient code to provide an answer. You should wait until the question does so and meets the site guidelines. If you're unclear on those guidelines, you can review them in the help center. Answering questions that do not meet the guidelines here provides no benefit to the site or it's goals of being a useful resource for programmers. — Ken White 17 secs ago

But yes it is "possible" but it also relies on programmers to know and do the right thing to make it work at runtime. So it is likely to cause bugs. — Pepijn Kramer 55 secs ago

@Dúthomhas: Programmers for exotic systems do need to care because struct foo *p = calloc(1, sizeof *p); will not send pointer members in the struct foo to null pointer values. — Eric Postpischil 39 secs ago

Please, post text as text, not as photographs of text. This is a website for programmers, not photographers. We want to copy&paste&run your code, copy&paste your inputs, read your outputs, and copy&paste&google your error messages, not critique your use of color and perspective. Also, please make sure to post everything relevant to answering your question in your question, not behind a link. meta.stackoverflow.com/a/285557/2988 idownvotedbecau.se/imageofcode idownvotedbecau.se/imageofanexception — Jörg W Mittag 55 secs ago

This question would better suit softwarerecs.stackexchange.com — Michał Krzywański 30 secs ago

-Wall -Werror is definitely a good idea. Don't we all wish it were the default setting for beginners and more savvy programmers too? — chqrlie 46 secs ago

1. Don't test private methods.. Test the behavior of the class - not how it does its job. 2. You're missing parens at expect retr.to eq('dummy text'). it should be expect(retr).to eq('dummy text'). — max 56 secs ago

Open letter to students with homework problems and How do I ask and answer homework questions? and Please do not upload images of code/data/errors when asking a question. — buran 48 secs ago

@Spencer format is C++20. Not so many programmers are using this version (don't know). — Jean-Baptiste Yunès 21 secs ago

@math4tots When C was new, the C preprocessor was even newer, and it was optional, not trusted/used by all programmers. But knowledge of those "really old platforms" (which weren't so old then) was more widespread. So p = 0 was a totally official way to get a null pointer, even if the bit pattern wasn't 0. But this isn't — or shouldn't be — surprising! float f = 0 gets you a machine-dependent bit pattern that might not be all-bits-0. For that matter, saying a = b + c gets you a machine-dependent opcode for the + operator. — Steve Summit 55 secs ago

"It's now question 5.10 in the C FAQ list." Huh, funny, I read that exact same page about an hour ago, but it didn't resolve all the doubt in my head that NULL still could be something else on some old platforms. But the idea that all programmers in those days having accepted p=0 as the 'official way to get a null pointer' like a widely known idiom is what did sealed it for me. — math4tots 35 secs ago

Questions that ask "where do I start?" are typically too broad and are not a good fit for this site. People have their own method for approaching the problem and because of this there cannot be a correct answer. Give a good read over Where to Start and edit your post. — gre_gor 31 secs ago

@MarkRansom: It wasn't stupid at all, in fact it's not well known that AES-GCM has any downsides, but this is significant one that often takes programmers by surprise. — President James K. Polk 40 secs ago

@AKX: Yes, exactly, it would help some programmers to have such an API but there has been an effort for the last decade or so to have "safer" crypto APIs that are more or less idiot-proof from a security PoV. But someone could certainly create their own API, and in particular Fernet's is relatively easy to recreate with streaming and without the plaintext embargo. — President James K. Polk 35 secs ago

Your question is pushing a bit towards being opinionated which is actually not the purpose of this forum. A better place to ask those kind of questions might be Software Engineering. — KDW 14 secs ago

I would fit this question, in this part which is referenced and valid. "software tools commonly used by programmers; and is" — Jhoedram 57 secs ago

"Do my homework for me" is off-topic for this site because SO isn't a free online coding service. 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. — itprorh66 6 secs ago

Another good reference: Open letter to students with homework problems — 0x5453 24 secs ago

That is a task dump not a Stack Overflow question. What have you tried and what specific step are you having problems with? Open letter to students with homework problems and How to ask homework questions: Make a genuine attempt yourself, show your code, ask a specific question. — kaylum 34 secs ago