You all have seen in previous post (Helloworld program) we have used something called as namespace . What it is actually? What its use?
Namespaces provide a method for preventing name conflicts in large projects.
Symbols declared inside a namespace block are placed in a named scope that prevents them from being mistaken for identically-named symbols in other scopes.
Multiple namespace blocks with the same name are allowed. All declarations within those blocks are declared in the named scope.
using namepace std;
It includes all C++ standard Libraries.