Just a general question;

Could somebody please explain to me the differences between "#include"-ing header files, and the "using namespace" code and what each does? Thanks :]

"#include" takes the whole text of a file and places it in this file.
"using namespace" is a completely different thing;
For C++ to avoid name collisions between same function names, there is an option that we declare a function not global, but part of a namespace.
Example:

Code:

---

#include <iostream>

int main()
{
    std::cout << "Hello World!";
    std::cin.get();
     
    return 0;
}

---

"using namespace" just makes all functions under this namespace global

Code:

---

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World!";
    cin.get();
     
    return 0;
}

---

So in your second example, int main and anything below it would be considered a global function?

Quote:

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Originally Posted by fthmdg

So in your second example, int main and anything below it would be considered a global function?

---

No. It puts the namespace "std" into the global namespace (so that std::cout is now in the global namespace and can now be called just cout, e.g.).

Exactly

so in a weird way namespaces are like groups of functions?
and using a namespace just allows you to call any of those functions from within that cpp file?

and header files are basically just a list of variables, prototypes, and other stuff like that

My bad, when i say "under the namespace" i mean "declared and/or defined inside the namespace". I should've though that you'd take it literally...

Well yeah, I figured that much. Thanks for the help :]