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How does the bitwise complement operator (~ tilde) work?
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How does the machine know it is getting a two complement negative number instead of a higher positive number? Is it because of the type system of the respective language indicating that the type is a signed int versus unsigned?
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How does password salt help against a rainbow table attack?
...d the salt, so when running the dictionary attack, she can simply use the known salt when attempting to crack the password.
A public salt does two things: makes it more time-consuming to crack a large list of passwords, and makes it infeasible to use a rainbow table.
To understand the first one, i...
Understanding how recursive functions work
...hose individually and when you are done you add the totals together.. Well now if each of you find some friend and split the buckets further, then you just need to wait for these other friends to figure out their totals, bring it back to each of you, you add it up. And so on. The special case is whe...
Best approach for GPGPU/CUDA/OpenCL in Java?
...L4Java is the only OpenCL binding that is available on all platforms right now (including MacOS X, FreeBSD, Linux, Windows, Solaris, all in Intel 32, 64 bits and ppc variants, thanks to its use of JNA).
It has demos that actually run fine from Java Web Start at least on Mac and Windows (to avoid ra...
Pushing empty commits to remote
I have pushed one commit to remote but now I realized that the commit message is not correct. I would like to change the commit message but AFAIK it is not possible. So i decided to create empty commit with correct message:
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MySQL: #126 - Incorrect key file for table
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First of all, you should know that keys and indices are synonyms in MySQL. If you look at the documentation about the CREATE TABLE Syntax, you can read:
KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as ju...
How to open a second activity on click of button in android app
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@HenryAspden i have edit my code now try this. i have put this code in onCreate try this way.
– J.D.
Nov 2 '12 at 12:15
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How to get the build/version number of your Android application?
...SION_NAME from BuildConfig
BuildConfig.VERSION_NAME
Yep, it's that easy now.
Is It Returning an Empty String for VERSION_NAME?
If you're getting a empty string for BuildConfig.VERSION_NAME then read on.
I kept getting an empty string for BuildConfig.VERSION_NAME because I wasn't setting the ve...
Get generic type of java.util.List
...ut if they're inside the same scope of the class/method where you need to know about them, then there's no point of knowing them, because you already have declared them yourself.
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How to switch position of two items in a Python list?
...The simple Python swap looks like this:
foo[i], foo[j] = foo[j], foo[i]
Now all you need to do is figure what i is, and that can easily be done with index:
i = foo.index("password2")
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