What is namespace used for, in C++?

Question

What is namespace used for, in C++?

using namespace std;

Answer 1

Namespace usually is used to prevent naming conflicts. So, One place where namespace comes into picture is

class ABC{
//  Does something for me.
};

class ABC{
// Does something for you..
};

int main() {
    ABC myABC;
    return 0;
}

This will give a compilation error as the system will not know which class is to be considered. Here the concept of namespace comes into picture.

namespace My{
    class ABC{
    //  Does something for me.
    };
}
namespace Your{   
    class ABC{
    // Does something for you..
    };
}
using My::ABC
// We explicitly mention that My ABC is to be used. 
int main() {
    ABC myABC;
    return 0;
}

Code will be much organized with the usage of namespaces.