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include <iostream>
using namespace std;
namespace {
	int Troll = 1;
	float Wizard = -0.5;
}
namespace Mordor {
	int Troll = 2 ;
	float Wizard = 0.5;
}
int main(void) {
	cout << Troll << " " << Wizard << endl;
	cout << Mordor::Troll << " " << Mordor::Wizard << endl;
	return 0;
}

prog.cpp:1:1: error: ‘include’ does not name a type
 include <iostream>
 ^~~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:12:2: error: ‘cout’ was not declared in this scope
  cout << Troll << " " << Wizard << endl;
  ^~~~
prog.cpp:12:36: error: ‘endl’ was not declared in this scope
  cout << Troll << " " << Wizard << endl;
                                    ^~~~

Standard output is empty