The inverse is XOR!

If you have:

    c = a^b;

You can get `a` or `b` back if you have the other value available:

    a = c^b; // or b^c (order is not important)
    b = c^a; // or a^c

For example if `a = 5`, `b = 3` (and thus `c = 6` as you mentioned) you get:

    b=0011 (3)            a=0101 (5)
    c=0110 (6) XOR   or   c=0110 (6) XOR
    ----------            ----------
    a=0101 (5)            b=0011 (3)

The inverse of XOR is XOR itself. &lt;br&gt;
I came across a similar problem on leetcode. [Leetcode-1720][1] &lt;br&gt;


  [1]: https://leetcode.com/problems/decode-xored-array/

The inverse of XOR is XOR itself. For example if you take this operation :

    3 ^ 4 = 7

The following statements are true :

    4 ^ 7 = 3

    3 ^ 7 = 4

Hopefully, this helps.



I&#39;m getting a compilation error inside of my `onClick`.

Here&#39;s the code.

    public class fieldsActivity extends Activity {

    Button addSiteButton;
    Button cancelButton;
    Button signInButton;


    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // to create a custom title bar for activity window
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

        setContentView(R.layout.fields);
        // use custom layout title bar
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.topbar);

        Pager adapter = new Pager();
        ViewPager mPager = (ViewPager) findViewById(R.id.fieldspager);
        mPager.setAdapter(adapter);
        mPager.setCurrentItem(1);



        addSiteButton = (Button) findViewById(R.id.addSiteButton);
        addSiteButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
               mPager.setCurrentItem(2, true); //Compilation error happens here.
            }


        });


        cancelButton = (Button) findViewById(R.id.cancel_button);
        signInButton = (Button) findViewById(R.id.sign_in_button);

    }

Variable is accessed within inner class. Needs to be declared final

In one of my tables `Fee` in column &quot;ReceiptNo&quot; in SQL Server 2012 database identity increment suddenly started jumping to 100s instead of 1 depending on the following two things.

1. if it is 1205446 it is jumps to 1206306, if it is 1206321, it jumps to 1207306 and if it is 1207314, it jumps to 1208306. What I want to make you note is that the last three digits remain constant i.e 306 whenever the jumping occurs as shown in the following picture.

2. this problem occurs when I restart my computer

![enter image description here][1]

  [1]: http://i.stack.imgur.com/tmjTp.jpg

Identity increment is jumping in SQL Server database

There is XOR function in Java - `a^b`

For exemple: `5^3 = 6`

Can you tell me inverse function? If I have `6` and `3` can i get range of numbers which include number `5`?

What is inverse function to XOR?

There is XOR function in Java - <code>a^b</code>
For exemple: <code>5^3 = 6</code>
Can you tell me inverse function? If I have <code>6</code> and <code>3</code> can i get range of numbers which include number <code>5</code>?

I am seeking to run a common Java program in both Windows and Linux.

The program needs to do some things differently on each platform.

So how can / should my Java program detect it is running under Linux vs. Windows?

Detecting Windows or Linux?

How do you check if Java SDK is installed on a Mac?

Is there a command line for this?


How do I check if the Java JDK is installed on Mac?

I have a final class, something like this:


    public final class RainOnTrees{
    
       public void startRain(){
    
            // some code here
       }
    }

I am using this class in some other class like this:

    public class Seasons{
            
       RainOnTrees rain = new RainOnTrees();
            
       public void findSeasonAndRain(){
            
            rain.startRain();
            
        }
    }

and in my JUnit test class for `Seasons.java` I want to mock the `RainOnTrees` class. How can I do this with Mockito?





How to mock a final class with mockito

I&#39;m wondering if there is any ideomatic way to chain multiple InputStreams into one continual InputStream in Java (or Scala).

What I need it for is to parse flat files that I load over the network from an FTP-Server. What I want to do is to take file[1..N], open up streams and then combine them into one stream. So when file1 comes to an end, I want to start reading from file2 and so on, until I reach the end of fileN. 

I need to read these files in a specific order, data comes from a legacy system that produces files in barches so data in one depends on data in another file, but I would like to handle them as one continual stream to simplify my domain logic interface. 

I searched around and found PipedInputStream, but I&#39;m not positive that is what I need. An example would be helpful.

How to chain multiple different InputStreams into one InputStream

I tried searching using Google Search and Stack&amp;nbsp;Overflow, but it didn&#39;t show up any results. I have seen this in opensource library code:

    Notification notification = new Notification(icon, tickerText, when);
    notification.defaults |= Notification.DEFAULT_SOUND;
    notification.defaults |= Notification.DEFAULT_VIBRATE;

What does &quot;|=&quot; ( `pipe equal operator` ) mean?


What does &quot;|=&quot; mean? (pipe equal operator)

Is there no XOR operator for booleans in golang?

I was trying to do something like `b1^b2` but it said it wasn&#39;t defined for booleans.

Content Type	Original Author	Original Content on Stackoverflow
Question	A.N.R.I	View Question on Stackoverflow
Solution 1 - Java	Veger	View Answer on Stackoverflow
Solution 2 - Java	Neel Alex	View Answer on Stackoverflow
Solution 3 - Java	Himanshu Gupta	View Answer on Stackoverflow

What is inverse function to XOR?

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Identity increment is jumping in SQL Server database

Variable is accessed within inner class. Needs to be declared final

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