1: //hello3.cpp 2: //Display a greeting. 3: //Explicitly qualify each item from namespace std, 4: //and there is thus no need for a using directive 5: //or any using declarations. 6: //This is an extreme approach, but is nevertheless 7: //recommended by some developers. 9: #include <iostream> 11: int main() 12: { 13: std::cout << "\nHello, world!"; 14: std::cout << "\nHow are you?\n" << std::endl; 15: }