Contoh program NameSpace Nested C++

#include<iostream.h>
namespace induk{
int i;
namespace Anak{
int j;
}
}
int main(){
Induk::i=10;
Induk::Anak::j=20;
cout<<"Nilai i : "<<Induk::i<<endl;
cout<<"Nilai j: "<<Induk::Anak::j<<endl<<endl;

using namespace Induk;
i=30;
Anak::j=40;
cout<<"Nilai i : "<<i<<endl;
cout<<"Nilai j : "<<Anak::j<<endl<<endl;

using namespace Anak;
i=50;
j=60;
cout<<"Nilai i: "<<i<<endl;
cout<<"Nilai j: "<<j<<endl<<endl;
return 0;
}