what's difference between using and include?
does using is use for standard library only?
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#include <iostream>
using std::cout;
using std::left;
using std::right;
#include <iomanip>
using std::setw;
does using is use for standard library only?
############### ##########
#include <iostream>
using std::cout;
using std::left;
using std::right;
#include <iomanip>
using std::setw;
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