Usage of octel,hexadecimal for integer literals with approprate example

I am the beginner of the java programming language.So can you help me on how do we employ the octel,hexadecimal for integer literals with suitable example eventually.......

http://java.sun.com/docs/books/tutorial/java/nutsandbolts/datatypes.html

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  • NumberFormatException when using Integer.decode with hex numbers

    hi folks, I have a simple test code to convert a hex string to an Integer. The odd thing is that it works for my hex strings that contains only numbers 0-9 but fails with a NumberFormatException for any hex string with the LEGAL hex characters a-f or A-F. The two examples below show the issue,
    import java.io.*;
    import java.util.*;
    public class decodeTest {
         public static void main(String[] args) throws NumberFormatException {
              //String t = "0xdeadbeef";
              String t = "0x12345678";
              Integer tmp = Integer.decode(t);
              System.out.println("String t = "+t);
              System.out.println("Integer tmp = "+tmp);
    }The result is as expected ,
    java decodeTestString t = 0x12345678
    Integer tmp = 305419896
    If I run the code (just replacing the hex string with any number of LEGAL hex characters a-f or A-F I get,
    import java.io.*;
    import java.util.*;
    public class decodeTest {
         public static void main(String[] args) throws NumberFormatException {
              String t = "0xdeadbeef";
              //String t = "0x12345678";
              Integer tmp = Integer.decode(t);
              System.out.println("String t = "+t);
              System.out.println("Integer tmp = "+tmp);
    java decodeTestException in thread "main" java.lang.NumberFormatException: For input string: "deadbeef"
         at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
         at java.lang.Integer.parseInt(Integer.java:484)
         at java.lang.Integer.valueOf(Integer.java:543)
         at java.lang.Integer.decode(Integer.java:941)
         at decodeTest.main(decodeTest.java:10)
    Any ideas would be greatly appreciated!!! (This error repeats for any hexstring with even one character of a-f or A-F)
    Mike

    mikerin wrote:
    The java doc on Integer.decode states that the input string is,
    public static Integer decode(String nm)
    throws NumberFormatException
    Decodes a String into an Integer. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:
    DecodableString:
    Signopt DecimalNumeral
    Signopt 0x HexDigits
    Signopt 0X HexDigits
    Signopt # HexDigits
    Signopt 0 OctalDigits
    Sign:
    I've tried using a string such as "-0xdeadbeef" or "+0xdeadbeef" with the same results. Is not the natural size of an Integer object 32 bits?
    So the max is 0xFFFFFFFF. my example of 0xdeadbeef is well within this.
    Still stuck!!
    MikeIf you read the docs more closely, you'll see that they say:
    "The sequence of characters following an (optional) negative sign and/or radix specifier ("0x", "0X", "#", or leading zero) [...] must represent a positive value"
    I'm not sure how the run time system is seeing it as a negative number??[http://en.wikipedia.org/wiki/Twos_complement]
    Edited by: jverd on Apr 27, 2010 5:37 PM

  • What index is suitable for a table with no unique columns and no primary key

    alpha
    beta 
    gamma
    col1
    col2
    col3
    100
    1
    -1
    a
    b
    c
    100
    1
    -2
    d
    e
    f
    101
    1
    -2
    t
    t
    y
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    2
    1
    j
    k
    l
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    gamma datatype-integer
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    col1
    col2
    col3
    Mudassar

    Many thanks for your explanation .
    When I tried querying using the below query on my heap table the sql server suggested to create NON CLUSTERED INDEX INCLUDING columns    ,[beta],[gamma] ,[col1] 
     ,[col2]     ,[col3]
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          ,[col2]
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    where   [alpha]='10100'
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  • LabVIEW DSC Logging too Many Data Points for Integer Tags

    Hi,
    I am having a strange problem with LabVIEW 2013 SP1 DSC data logging, running on XP SP3.
    All the integer Data Type Tags in my Tag Database that are set to data log, are logging way too much data. When I look at the amount of logged data points for these int16 in Historical view I see its logging a point nearly every second. See screen shots below or attached jpeg's of screen shots of trace view and Trace Props of one of the integer Tags. I would prefer the integer tags to only log on change like the boolean tags.
    These tags are being acquired from a Horner OCS over Modbus Serial RTU. The Modbus comms is set-up to poll once a second.
    The problematic Tag Data Type in DSC logging are Int16
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    I would have expected int16 tags to only log a value when the value changes and since the 'update deadband' tag setting is disabled for integer tag properties there is no way to config the tag to only log on changes. What is the default logging config for integers. Log everything or log on any change?
    I would prefer for these integer tags to only log on change, since they change infrequently, log on change would be much more data efficient.
    I tried changing the tag data type to floating point and gave it an update deadband value to try and see if that would reduce the amount of logged data, it didn't seem to make any difference.
    Not sure if the issue lies in the
    > Modbus Comms
    > The DSC data event tracking module
    > The DSC Data Logging module
    > Some kind of  Horner OSC data type mismatch which results in DSC polling seeing the acquired value as having changed on every poll.
    Any suggestions greatly appreciated
    Thanks
    Paul
    Attachments:
    Integer Tag Data Points Trace View.jpg ‏125 KB
    Integer Tags Data Points Tag Properties.jpg ‏42 KB

    This definitely sounds like a citadel/logos issue. There are two possibilities:
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    2) corrupt logos
    To see if it is a corrupt database, simply go to your database folder and move all the files out of that folder to a different folder. Then restart the application. Your application will create a clean database. This may solve the problem. If so, then you know it is a corrupt database.
    To upgrade/reinstall logos, go to the Control Panel -> Add/Remove Programs. If you see logos there, uninstall it. After uninstalling it, install the most recent logos version (found at ftp://ftp.ni.com/support/lookout/logos).
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    Thanks.

  • What is the Quoting Mechanism for String Literals?

    Oracle 10G enterprise edition
    Hi all,
    I am trying to use the new feature support for string literals in 10G.but unfortunately it returns an error. Is there any settings to be done to get implemented with this feature?
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    Thanks
    Ram

    Art in oracle wrote:
    Oracle 10G enterprise editionAre you sure you are using 10g? (which version?)
    It works ok for me... (10.2.0.1)
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    Hello,
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    Termination event received for process 4780 mtrmgr 3/4/2015 6:59:53 PM 952 (0x03B8)
    Thank you
    Loyan

    Hello,
    80004005 is a general error, this will not help with the issue. Check system status, component status.
    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

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