namespace std Using namespace std imports the content of the std namespace in the current one Thus the advantage is that you won t have to type std in front of all functions of that namespace However it may happen that you have different namespaces that
In C a namespace is a collection of related names or identifiers functions class variables which helps to separate these identifiers from similar identifiers in other namespaces or the global namespace The identifiers of the C standard library are defined in a namespace called std What is the use of using namespace std I d like to see explanation in Layman terms c namespaces std using Share Improve this question Follow edited Nov 2 2016 at 13 45 Saurav Sahu 13 4k 8 66 82 asked Sep 20 2013 at 10 06 Jarvis 627 1 6 4 7 In layman terms don t do that Here be dragons Fr d ric Hamidi Sep 20 2013 at 10 08
namespace std
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The using directive using namespace std at any namespace scope introduces every name from the namespace std into the global namespace since the global namespace is the nearest namespace that contains both std and any user declared namespace which may lead to undesirable name collisions Using namespace std is the same as using namespace std The symbol is the scope resolution operator When used without a scope name before it it refers to the global namespace This means that std is a top level namespace and is not enclosed in another The spaces before and after the are optional in this case because the lexer
All C standard library types and functions are declared in the std namespace or namespaces nested inside std Nested namespaces Namespaces may be nested An ordinary nested namespace has unqualified access to its parent s members but the parent members do not have unqualified access to the nested namespace Defining a Namespace A namespace definition begins with the keyword namespace followed by the namespace name as follows namespace namespace name code declarations i e variable int a method void add classes class student It is to be noted that there is no semicolon after the closing brace
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GeeksforGeeks Why it is important to write using namespace std in C program Read Courses Practice In this article we will discuss the use of using namespace std in the C program Need of namespace As the same name can t be given to multiple variables functions classes etc in the same scope 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 The program will know to look in the std library to find the object Namespace std contains all the classes objects and functions of the standard C library
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