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Will the below string contain the null terminator '\0'?
std::string temp = "hello whats up"; 
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In C the strings are basically array of characters. In C++ the std::string is an advancement of that array. There are some additional features with the traditional character array. The null terminated strings are basically a sequence of characters, and the last element is one null character (denoted by '\0').
Thus, NULL isn't a valid value for a std::string. They *can't* really be NULL. The relevant overloads for std::string are to compare a std::string to a std::string, a char* to a std::string, or a std::string to a char*.
No, but if you say temp.c_str() a null terminator will be included in the return from this method.
It's also worth saying that you can include a null character in a string just like any other character.
string s("hello"); cout << s.size() << ' '; s[1] = '\0'; cout << s.size() << '\n'; prints
5 5
and not 5 1 as you might expect if null characters had a special meaning for strings.
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