Why am I getting a null pointer when adding to the end of a linked list
What is a NullPointerException, and how do I fix it?
“While” loop without “do”; “if” statement without “then” I have a similar question as this :     How can I get rid of the do in a for loop and the then in an if   statement when typesetting algorithms using the algorithm and   algorithmicx packages?   but I want the same thing for algorithm2e package.  A minimal compilable example:  \documentclass[10pt]{article} \usepackage[linesnumbered,ruled]{algorithm2e} \SetKwRepeat{Do}{do}{while} \SetKw{KwGoTo}{go to}  \begin{document}  \begin{algorithm} \DontPrintSemicolon \KwIn{$A,B$} \KwOut{$C$} \While{$B &gt; 0$} {      $C = C+1$;      $B = B-1$;     \uIf{$C &gt; A$}        {            \textbf{break}\;        } } \caption{ABC} \end{algorithm}  \end{document} My machine is currently running Windows 7. I have 2 partitions: OS (C:) and DATA (D:). I intend to do a native Ubuntu 14.04 install. Assuming I format my Windows OS partition, will I have full access to my D partition in Ubuntu ? Are all algebraic integers with absolute value 1 roots of unity? Can I configure bash to execute "clear" before every command typed in the console? I would like to configure bash to execute clear command every time I type some command in the terminal (before executing my command). How can I do that?  I'm using Debian Linux. An inequality for a sum of sine functions I want to show for $x\in\mathbb{R}$, the following inequality holds. $$ \left|\sin x\right|+\left|\sin (x+1)\right|+\left|\sin (x+2)\right|&gt;8/5. $$ This trigonometric inequality has been verified by Mathematica using the Plot commend. However, using the sum formula for the sine function seems doesn't work, and I cannot give a rigorous proof of it. Any suggestion, idea, or comment is welcome, thanks! Recently my audio input, from USB headset and USB guitar cable have stopped working. Going into Windows 'Sounds' and enabling 'Listen to this device' outputs the audio as expected; the problem is not with the devices. However, as soon as I try to use them with any other program, discord, for example, no audio input is detected by discord.  I have tried everything I can think of and some suggestions from Googling around;   Updating everything - windows, drivers, all related software Rolling windows back to the last build Trying different USB ports Reinstalling drivers and software Running Windows troubleshooters Playing with device properties settings   But nothing seems to work, any suggestions? I have just updated to Minecraft 1.7.4 and now all of a sudden there are barely any mobs spawning.  I checked to make sure that I was in normal difficult and I saw 1 creeper but that is all.  Also I tried different difficulties. Another thing - mobs seem to to spawn normally in the nether and all other mobs except aggressive mobs spawn like they should.  Please if you know how to fix this, please help! What is the intuition behind defining completeness in a statistic as being impossible to form an unbiased estimator of $0$ from it? How do you reverse a string in place in C or C++? let's imagine i am at school with an android phone. I have a computer at home and that computer has a virtual machine working on it. here is the scenario, client and virtual client has ssh-client and ssh-server both and they can communicate each other in the local network.  when i want to connect to my virtual client from school by android phone through internet there must be an ip address.  the problem is virtual machine and client has the same public ip. so how do i connect one of the two machines? Is there an analytic function $f$ on $B(0,1)$ the open ball with radius 1 such that $f(1/n)=e^{-n}$ for $n=2,3,4,...$? Is there an analytic function $f$ on $B(0,1)\subset\mathbb{C}$ such that $f(1/n)=e^{-n}$ for $n=2,3,4,...$? I know the following doesn't work:  Let $g(z)=\exp(-1/z)$. Then, $f=g$ on a sequence with a limit point in $B(0,1)$ and so $f=g$ on $B(0,1)$. Since $g$ is not $\mathbb{C}$-differentiable at $0$, neither is $f$ and so such a function cannot exist.  This is not the solution because you cannot use the identity principle with a non analytic function like $\exp(-1/z)$ is not analytic at $z=0$. Any help using the identity principle another way? Prove that $x^{2} \equiv -1 \pmod p$ has no solutions if prime $p \equiv 3 \pmod 4$. How to disable Windows 10 system log In Windows 10 Resource Monitor I found that the system process is constantly writing C:\ProgramData\Microsoft\Windows\wfp\wfpdiag.etl at like 30-100KB/s. This equals 1TB write/year which is not healthy for SSD. There are other log write like C:\Windows\System32\LogFiles*** too.   Although logs is needed for diagnostics, it's better to be turned on only when problem has already occured.  Is it possible to disable as much system logs as possible to decrease garbage write amoung to SSD? Intuition behind the Definition of Conditional Probability (for 2 Events) How to wrap lines in a jtable cell? Cancel a vote so that the tally goes back to zero and not minus How can I make my browser lie about my operating system? I'm using Chromium (Version 30.0.1599.114 Ubuntu 12.10) under Linux. I'm trying to access  that claims that it doesn't work under Linux. Of course, this is most likely crazy since the web is platform-independent (unless they're using some kind of evil plug-in).  I've used a user agent switcher to supply a Windows user agent, but to no avail. Upon viewing the source, it appears that the site is using Javascript to determine the operating system. I'm looking for a way to get my browser to report in Javascript that it is Windows or MacOS.  Do you know how to do it? Example sentence:     I love when your dog just lets you sit there to pet them. You don’t necessarily know if they are enjoying it, but they love you enough to just sit there with you for a bit.   Is this correct? We assume the words "you" and "your" refer to the speaker of the sentence, and not to the listener, as second-person usually does. But it also refers to dog owners in general. I have always been curious about this. How do I make Units efficiently? I just blew almost all my money on a really cool lookin' ship. How do I regain solvency without spending a lot of time fiddling around in my inventory?  At the moment I've found a sequence of steps that'll turn 50 carbon and 100 Plutonium into ~5000 Units (by creating Suspension Fluid and then turning it into Electron Vapor). Are there better recipes or sequences of recipes I should look for? Or should I just drop the whole thing and go mine a particular mineral? What makes induction (over natural numbers) a valid proof technique? Is $$ \dfrac{ P(0) \quad \forall i \in \mathbb{N}. P(i) \Rightarrow P(i+1) }{ \forall n \in \mathbb{N}.  P(n)} $$ just taken for granted as a proof rule, or can it be derived from more foundational axioms?  Similarly, can the principle of induction over well-founded sets be derived from something more foundational, or does it have to be assumed to be a valid inference rule?