Do I need to learn C++?

I just got the iOS 5 cookbook and it suggests that one needs to learn a bit C++ before learning Objective-C.  So how much is a bit?  I mean exactly how much C++ knowlege do I need to learn Objective-C and iphone app development?

From the Beginner's Guide :
-=-
You mentioned looking for some place to start with coding and Objective-C. This is a good idea. I think it's always smart to learn the various languages involved first, before you move to a specific platform such as iPhone. Objective-C is the language you will want to learn for iPhone development.
However, keep in mind that Objective-C is just a superset of (an extension to) the C language, so trying to learn Objective-C will most likely not be realistic if you don't have a solid foundation with C first. Luckily, there are a few good books out there on Objective-C, and many on C.
-=-
<Edited by Host>

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    give Transaction Code : MM01 and press Enter
    after that
    1) select MATNR field click on Source filed(this is the field mapping) select MATNR and press Enter
    2) select MBRSH field click on Source filed(this is the field mapping) select MBRSH and press Enter
    3) select MTART field click on Source filed(this is the field mapping) select MTART and press Enter
    4) select MAKTX field click on Source filed(this is the field mapping) select MAKTX and press Enter
    5) select MEINS field click on Source filed(this is the field mapping) select MEINS and press Enter
    finally
    save & come back
    6) select radio-Button 6 and execute
    Maintain Fixed Values, Translations, User-Defined Routines
    Create FIXED VALUE Name & Description as MM01
    Create Translations Name & Description as MM01
    Create User-Defined Routines Name & Description as MM01
    after that delete all the above three just created in the 6th step
    FIXED VALUE --MM01
    Translations --MM01
    User-Defined Routines --MM01
    come back
    7) select radio-Button 7 and execute
    Specify Files
    select On the PC (Frontend) -- and click on Create button(f5)
    give the path of the file like "c:material_data.txt"
    description : -
    separators as select comma radiao- button
    and press enter save & come back
    8) select radio-Button 8 and execute
    Assign Files
    Save & come back
    9) select radio-Button 9 and execute
    Read Files
    Execute
    come back
    come back
    10) select radio-Button 10 and execute
    Display Imported Data
    Execute and press enter
    come back
    Come back
    11) select radio-Button 11 and execute
    Convert Data
    Execute
    come back
    Come back
    12) select radio-Button 12 and execute
    Display Converted Data
    Execute & come back
    13) select radio-Button 13 and execute
    Start Direct Input Program
    --select the Program
    --select continue button
    --go with via physical file
    --give the lock mode as 'E'
    and execute
    Refer these links,
    LSMW
    http://www.sapgenie.com/saptech/lsmw.htm
    http://service.sap.com/lsmw
    http://www.sapbrain.com/TUTORIALS/TECHNICAL/LSMW_tutorial.html
    http://www.scmexpertonline.com/downloads/SCM_LSMW_StepsOnWeb.doc
    Regards

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