why we using namespace std in c++ (IN URDU)
In this video i explained that why we use using namespace std in our program what is basically the purpose of namespace std...
EXPLAINING :- There are two students in one classroom having same name for example Vishal. now if we need to differentiate each of them , we would have to use some info along their name like their area of living , physical characteristics etc.
same goes with namespaces in C++ , you might have a variable named for example value in your C++ program , and there maybe a library which contains a variable named value in it. now there is no way for the compiler to know which version of variable value is being called in the code.
a namespace is designed to overcome this difficulty and is used as additional information to differentiate similar functions , variables etc. with the same name available in different libraries. Using namespace, you can define the context in which names are defined.
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