What is the main use of namespace? And what if we don't use it in our program?

Answer 1

https://www.sololearn.com/Discuss/167619/?ref=app

Answer 2

Namespaces are used in C++ to organize code. You can easyle define your own namespace:

namespace myNamespace{

// your normal C++ code

}

You get access to a function or member or class or whatever in a namespace by the :: syntax. So you would get access to the namespace defined above vy myNamespace::myFunction()

If you dont want to write that much, use "using namespace myNamespace" and you can use myFunction directly.

There are some very big namespaces in C++ and one of them contains the standard library. Its name ist std. thats why you have to use using namespace std or std::