Xcode using namespace std

Helping a friend with his C++ class and I'm a little rusty...not a programmer but I did really enjoy the class. We noticed that we are having a problem with the initial heading working correctly in Xcode:

#include <iostream>

using namespace std;

std on my programs from last year is highlighted in purple and through out the program all my cout & cin code is as well. If I remember correctly std is found in the iostream library that I have called to be included in the program. We do that because if not I would be typing std::cout, std::cin, etc over and over again in a program, right?

For some reason std is not highlighting purple...it just stays black as does the associated commands (cout, cin). The program will not run at all. I just tried to do a simple print text to the screen but nothing and that is when I noticed the std problem.

Any fixes? Anyone know why this problem is happening? Now I'm curious and a little ****** off I can't get it to work...but I need to be working on Calc 2 not this!

Thanks guys and gals!