#include<iostream> int main() { std::cout << "Hello world!" << std::endl; return(0); }
No, the use of 'namespace std' is not compulsory. You can specifiy it on any object reference. Specifying 'namespace' simply provides a default value. Contrast ... using namespace std; cout << "Hello world!" << endl; ... with ... std::cout << "Hello world!" << std::endl;
A user-defined manipulator is a function which can be passed as an argument to the stream insertion or extraction operator overloads. For example, the output stream insertion operator has the following overload: std::ostream& operator<< (std::ostream& st, std::ostream& (*func) (std::ostream&)); The second argument is the function pointer, with the following signature: std::ostream& (*func) (std::ostream&) Any function that matches this signature can be used as a manipulator. For instance, the following user-defined manipulator does exactly the same job as the std::endl manipulator: std::ostream& my_manipulator (std::ostream& os) { return os << '\n' << std::flush; } Example usage: std::cout << "Hello world!" << my_manipulator; You can, of course, provide your own implementations to perform any type of manipulation. For example, suppose you want a manipulator that inserts an elipses into an output stream: std::ostream& elipses (std::ostream& os) { return os << "..."; } Example usage: std::cout << "Hello" << elipses << "world!" << my_manipulator; Output: Hello...world!
No. There is no Capital of the World. Jerusalem is the capital of Israel, nowhere else.
#include<iostream> int main() { std::cout << "Hello world!" << std::endl; }
there are 67 capital cities in the world.
#include<iostream> int main() { std::cout << "Hello world!" << std::endl; }
#include<iostream> int main() { std::cout << "Hello world!" << std::endl; return(0); }
Middleborough, Massachusetts, is the "Cranberry Capital of the World."
The pumpkin capital in the world is Morton, Illinois.
it's not the murder capital of the WORLD.
The Soybean Capital of the World is Decatur, Illinois.