Nouvelle formation ! Tous les codeurs devraient apprendre l'IA générative !
Essayez une leçon gratuite0
Why do we need to do usingnamespace std and what is int main and why we use it?
Well my question is the title please,please answer Im a 12 year old trying to learn C++ Example to help you: #include <iostream> using namespace std; int main() { cout << "Hello world!"; return 0; }
3 Réponses
0
using namespace std prevents from having to do std:: in front of thing like cin, cout, endl, etc. int main is the, as it says, main function of your program. This is where everything starts.
0
std is the standard namespace of c++. If hadn't put it there you had to write for example std::cout for printing. std is the namespace of the standard c++ library. You can use other namespace and define your own - but that is only important for large projects. You will be fine in std for a while. int main ist the main function of a c/c++ program. If you want to have runnable code - you will need this function. it's int - because main returns an integer - it's standard to return 0, if your program runs fell or return with some failure value if something had gone wrong.
0
My Advice
Just forget about it and keep moving forward ...when you start module on classes and object you will be able to use #include and namespace