http://www.cplusplus.com/doc/tutorial/namespaces/ Here is a nice explanation.
On Thu, Nov 15, 2012 at 11:52 AM, Rahul Kumar Dubey <[email protected]>wrote: > "using namespace std" --> it specify that we want to use whole namespace > named* std .* > > In std namespace varous objects like cout, cin ,endl etc are define > if we donot use std namespace then we have to explicitly specify name > namespace in which particular objects are defined > eg. std::cout<<"hello world "; > std::cin>>x; etc * > for more deatils about namespaces read chapter 10 part 1 (thinking in C++ > by bruceckel , very nice explanation ) > * > > > On Tue, Oct 9, 2012 at 8:52 PM, rishabh singh yadav < > [email protected]> wrote: > >> namespaces allows us to group a set of global classes, objects and/or >> functions under a name. If you specify *using namespace std* then you >> don't have to put *std::* throughout your code. >> >> >> On Tue, Oct 9, 2012 at 7:46 PM, rahul sharma <[email protected]>wrote: >> >>> That i know..please tell me its use and need >>> >>> >>> On Tue, Oct 9, 2012 at 12:05 AM, Abhishek Patro <[email protected]>wrote: >>> >>>> if u have seen the iostream file then it begins like this:- >>>> >>>> #include <bits/c++config.h> >>>> #include <ostream> >>>> #include <istream> >>>> * >>>> * >>>> *namespace std * >>>> { >>>> /** >>>> * @name Standard Stream Objects >>>> * >>>> * The <iostream> header declares the eight <em>standard stream >>>> * objects</em>. For other declarations, see >>>> * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#10 and >>>> the >>>> * @link s27_2_iosfwd I/O forward declarations @endlink >>>> * >>>> * They are required by default to cooperate with the global C >>>> library's >>>> * @c FILE streams, and to be available during program startup and >>>> * termination. For more information, see the HOWTO linked to above. >>>> */ >>>> //@{ >>>> extern istream cin; ///< Linked to standard input >>>> extern ostream cout; ///< Linked to standard output >>>> extern ostream cerr; ///< Linked to standard error (unbuffered) >>>> >>>> The new implementation is done in C# format. So we use the term "using" >>>> to include the iostream "package". >>>> >>>> >>>> >>>> On Tue, Oct 9, 2012 at 12:01 AM, rahul sharma >>>> <[email protected]>wrote: >>>> >>>>> using name space std >>>>> >>>>> Please explain about this >>>>> thnx >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Algorithm Geeks" group. >>>>> To post to this group, send email to [email protected]. >>>>> To unsubscribe from this group, send email to >>>>> [email protected]. >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>> >>>> >>>> >>>> >>>> -- >>>> Abhishek Patro >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Algorithm Geeks" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > > > -- > *RAHUL KUMAR DUBEY* > *BTech-3rd year * > *Computer Science &Engineering * > *Motilal Nehru National Institute Of Technology* > *Allahabad[211004],UP.* > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > --
