basic question on namespaces

[kefka95]

Let's say I have the following simple program:

#include <iostream>
#include <cmath>

int main()
{
	std::cout << "5.5 squared is " << pow(5.5,2);
	return 0;
}

I understand the basic reason for the std:: preface, but why am I required to use std:: in front of cout, but not in front of pow()? Is it because pow() comes from a C header file? Should I use std:: in front of pow() anyway?

[Disch]

Is it because pow() comes from a C header file?

Yes

Should I use std:: in front of pow() anyway?

You can. I try to. But it doesn't really matter.