how to use namespaces be nested in C++?Write the program.

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#include <iostream>
int x = 20;
namespace outer {
int x = 10;
namespace inner {
int z = x; // this x refers to outer::x
}
}
int main()
{
std::cout<<outer::inner::z; //prints 10
getchar();
return 0;
}

 

Output :
10.

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