Convert a String In C++ To Upper Case

Question

How could one convert a string to upper case. The examples I have found from googling only have to deal with chars.

Answer 1

string StringToUpper(string strToConvert)
{
   for (std::string::iterator p = strToConvert.begin(); strToConvert.end() != p; ++p)
       *p = toupper(*p);

   return p;
}

Or,

string StringToUpper(string strToConvert)
{
    std::transform(strToConvert.begin(), strToConvert.end(), strToConvert.begin(), ::toupper);

    return strToConvert;
}