Is there any alternative for auto &c in c++

Hello kindly i am a beginner and new to this platform,,I am trying to run a program to test a valid password with uppercase,lowercase letters and atleast one number.Part of the program is...

bool hasUpperCase(const string password)
    {
    enter code here

    for (auto &c : password)
    {
        if (isupper(c))
            return true;
    }
    return false;
    }

I have tried running the whole program on my compiler which is Falcon C++ but it keeps giving me this error," 'auto' will change meaning in C++0x; please remove it " How can I remove it and what is its alternative.

NB- the program runs on other compilers such as Onlinegdb.com and C++ shell