dcsimg
CodeGuru Home VC++ / MFC / C++ .NET / C# Visual Basic VB Forums Developer.com
Results 1 to 4 of 4

Thread: How to Swap two numbers without using third variable in Java?

  1. #1
    Join Date
    Sep 2016
    Location
    Bhopal , Madhya pradesh
    Posts
    15

    How to Swap two numbers without using third variable in Java?

    How to Swap two numbers without using third variable in Java?

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012
    Location
    England
    Posts
    6,478

    Re: How to Swap two numbers without using third variable in Java?

    A quick google search provides plenty of answers! Consider
    Code:
    int x = 10, y = 5;
     
      // Code to swap 'x' and 'y'
      x = x + y;  // x now becomes 15
      y = x - y;  // y becomes 10
      x = x - y;  // x becomes 5
    Note that this may be imprecise for non-integer numbers due to rounding errors.

    For a detailed discussion see
    http://javarevisited.blogspot.co.uk/...-tutorial.html
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.8.9)

  3. #3
    Join Date
    Oct 2017
    Posts
    5

    Re: How to Swap two numbers without using third variable in Java?

    You can refer below resource for swapping two numbers,
    http://www.flowerbrackets.com/java-swap/

  4. #4
    Join Date
    Feb 2017
    Posts
    359

    Re: How to Swap two numbers without using third variable in Java?

    Quote Originally Posted by arshi1586 View Post
    How to Swap two numbers without using third variable in Java?
    The most "famous" way to do that I suppose is the XOR Swap Algorithm,

    https://en.wikipedia.org/wiki/XOR_swap_algorithm

    The algorithm is language independent and it works on bit patterns regardless of whatever the bits may represent at a higher level (such as for example a Java int). So you can swap any data type as long as it supports the XOR bitwise operator (and if it doesn't it's sometimes possible to cast to some type that does without actually copying anything).

    Note that if you feel a need for algorithms like this in an application for performance reasons then Java probably isn't the optimal language.
    Last edited by wolle; July 24th, 2018 at 12:37 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


Windows Mobile Development Center


Click Here to Expand Forum to Full Width




On-Demand Webinars (sponsored)