return 0 3b c 2b 2b

1// This example gives a reason why you should use using namespace std
2#include <iostream>
3using namespace std;
4cout << "Hello "<<endl; /* this one is shorter*/
5// without the using namespace std you will need to use this
6std::cout <<"Hello"<<std::cout<<endl /* this one is longer 
7and it requires shorter amount of time */