vc6和vc2017在std写法上的区别

vc6

#include <iostream>
/*using namespace std;*/
int main()
{
	std::cout << "Hello World!\n" << std::endl;
	return 0;
}

 

vc2017

#include <iostream>
using namespace std;
int main()
{
	cout << "Hello World!\n" <<endl;

}