If anyone here knows Objective-C...
I am having a problem with an app I am creating. What it does is it opens the app, then immediately crashes. (If anyone's wondering, it's a Tab-Bar based application) The exception I get is "EXC_BAD_ACCESS". So as any good programmer does in a situation like this, I googled the error. It turns out that that happens if a command is passed to a released object, this exception is thrown. I also learned about NSZombieEnabled. That is supposed to print out the command that is causing the exception. But when I go into the console, nothing is printed out! I think it has to do either with the default files that come with the Tab-Bar application, or with the .xib files I have. I think this because I copied over the .xib files to a new (Tab-Bar based) application, and the same error occurred. I'm just about to throw in the towel on this one, so if anyone knows what to do here, please let me know.
Primes in Computer Encryption
Huge primes are used in computer encryption, which was explained very well in a post by mathsyperson: (I'm paraphrasing, as the post was long, and I can't find it.)
Let's say that Person A wants to send something through the mail to Person B. It is of considerable value, so A wants to make sure that it is not stolen. However, shady Person C (who happens to be the only mailman for miles around) wants to steal it. So Person A puts a lock on it. However, Person B doesn't have the key to the lock, so B puts another lock on it and sends it back to A. A takes his lock off, and sends it back to B. B takes off his lock, and the item is safe, even though both have probably spent their life's savings on locks, and shipping costs. With hackers, it's the same deal, except valuable items are replaced with valuable data, and locks are replaced with very, very large prime numbers.
Mersenne Primes and the Prime95 (GIMPS) Project
Mersenne primes are prime numbers of the form
For some reason, I sometimes need to log in twice to actually get logged in. When I log in the first time, it goes back to the normal page when you are not logged in, with the log-in fields at the left. It does do the "Logged in successfully" screen. It does it in both Firefox and Chrome. I haven't tried it in any other browsers.
I'm trying to make a Mafiya game in Python, but have run into problems. Here's what I'm worried about:
import random def Start(): day = 0 #This variable definition should work... DayTime() ...
Here's what I get when I run it:
Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> Start() File "/Users/Rayment/Documents/Chase/games/Python/Mafiya!", line 5, in Start DayTime() File "/Users/Rayment/Documents/Chase/games/Python/Mafiya!", line 7, in DayTime day = day + 1; UnboundLocalError: local variable 'day' referenced before assignment
I know that means that my variable definition is wrong, but it should be right. What gives?
Hmm... that's not making much sense to me. Do you mean: