C,C++ : using, namespace(std::cout,std::endl)

 

https://youtu.be/kAsnMlsB_Ks

#include <iostream>
using namespace std;

using std::cout;
using std::cin;
using std::endl;

#include <iostream>
namespace MYSPACE
{
	int g_int;
}

int main()
{
	MYSPACE::g_int = 100;
	return 0;
}