headerfile1 using namespace std When we use names of variables, functions, etc., we use one unique name in one namespace. We can use a variable name "num" in one namespace, and the same name in another namespace. And it can be used like the following: N1::numN2::num Of course, they are different variables. By typing "using namespace std" after typing "#include ", we can use names in the standard library directly like "cout" in.. 2023. 7. 2. 이전 1 다음