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by: almhdydigital
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Category: Guest Posts
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Is there a corpus of “general” C programs?

I am studying the properties of control flow graphs (CFGs) in general. The tool that I use to statically extract CFGs and label them is based on LLVM. Now, I am looking for a large corpus of C/C++ programs (>= 100 programs) that could be used in experiments. There are basically only two requirements:

  • Programs should be easy to compile using clang. Preferably single file programs or simple make/cmake projects, and
  • the set of programs should represent multiple application domains.

Although, at this point, the first requirement is prioritized.

Ruby on Rails newbie question, regarding general design for models/controlers for feedback app/ my thinking

I am working on a little project which essentially allows me as the administrator to upload new products to the app (each product would be a video explaining product) which would have its own specific questionaire (specific to product), and as admin input which users are allowed to see this product and answer the product specific questionaire (send to specific email addresses, each product has different questions and different number of Qs). Users who were selected for a product would receive a link to their email and come to the site and answer the questionaire for the product. Once the user fills out questionaire and submits they will not be able to see the product again.

So I am just thinking about the general design for this app. Keep in mind I do not have a ton of experience so maybe my thinking is not the best. Here is what I had in mind.

Models: Product (description, video (through active storage), completed_users(list of users who have completed and can currently can not see product)),:has Questionaire? :has Users (list of users who still have access to product for review)

Users (demographic info, name, finishedReview(list of products already veiws by user)) :has Product? (the products they still haven’t review, which would be deleted after review?)

Questionaire belongs to Product (do I need a questionaire specific model? Or just keep each products questions in an array in Product? (each would be different length))

Also I am trying to think specifically how to implement each product having a different questionnaire with different lengths and questions. I guess I am confused sometimes when to create a model and when to just keep it in one model as an attribute. Is the model made in this situation if it will be used by multiple other models?

Thanks for any help on my thoughts for this, love to hear some feedback!

Are there any general rules that govern the visibility of magical effects?

Are there any general rules that govern the visibility of magical effects?

Sometimes it’s not clear. Last session one of my players complained when I allowed a bunch enemies to identify his character’s magical ability (Nymph’s Blinding beauty) as a glow around his character.

This brought up the issue that the rules are not always clear when an effect is visible or not.

Here are the things I know:

  1. Generally spells have visible effects (e.g. you can see a fireball explode in your face).
  2. Most times magical items glow (or at least can glow). Sometimes they may have more telling effects – e.g. the flaming property on a sword.
  3. There is the “Invisible spell” metamagic feat. It implies that to get less visible effects, you must invest resources, meaning you don’t usually get it for free.

Things however get rather murky when venturing into the territory of Supernatural abilities and the myriad monster abilities out there.

What about the Nymph’s Deflection bonus? Would that be visible? What about an Su Fear Aura? An Su Tongues effect that many celestials have?

I’d like answers from both 3.5e and Pathfinder. (We play a mix, and omissions in one can usually be reasonably filled by the other.)

If there’s no definite answer, I would nevertheless appreciate a couple of opinions on what’s reasonable, what not, and where to draw the line.

General SQL Question

Let’s say a user goes to the log in page of my website and creates an account. Instead of entering their real name, they decide to write some sql code and try to gain access to my database.

I have prepared statements to prevent any harmful code from altering my database at the signup process, however if the user goes to create a post, comment, or reply, my website will use their info like their username to create/display new data in the website.

My main concern is that someone could store code within my database and access it somewhere else when I’m not expecting it.

I am capable of preparing statements for everything involving my database, but my question is different. I want to know if I should be concerned about usernames writing sql code after they become strings in the prepared statements, is the threat eliminated for good or not?

Does formal specification of UX needs special language apart from the general specification languages?

I am fan of Alloy and CASL specification languages and my question is – what is the common practice regarding the formal methods in UX? Does UX require distinct specification languages? Generally one can use any specification language to describe: 1) the graphical layout of the screen and available commands; 2) the content of the available commands. UX just gives additional constraints on the specification, some non-logical (outside, empirical) guidelines of the content on the specification. Or I am wrong and computer science community has special methods for modern graphical web/mobile/TV/device/wearable programming and for modern UX programming?

What are some general lines of attack when proving that some system of axioms is not equivalent to some other system?

I created two axioms, we can call them $ A_1$ and $ A_2$ , inside a theory $ T$ axiomatized by axioms $ \{B_1,…,B_k\}$ .

There is one axiom from a theory $ T$ , for example $ B_k$ , that I can prove with $ A_1$ and $ A_2$ inside a theory $ T \setminus \{B_k\}$ , that is, I can prove that $ (T \setminus \{B_k\}) \cup \{A_1,A_2\}$ implies $ T$ .

But, I am not sure does $ T$ implies $ T \cup \{A_1,A_2\}$ .

What are some general lines of attack on such a problems?

What do you suggest me to read to understand better the issues in problems like these ones?

My training in mathematical logic is at some basic undergraduate level, and I think that in advanced mathematics all of this has been investigated and well-understood, I just need some guidelines and to know where to start from.

If this question is not appropriate for MO notify me and I will delete it.