Question

A header file contains a class template, and in that class there is a C++ string object.

Group of answer choices(Pick one)

1)There should be a #include for the string library AND a using namespace std; in the header file.

2)There should be a #include for the string library.

3)There should be a #include for the string library AND a using namespace std; in the main program's CPP file, written before the H file's include.

Answer 1

Correct Answer:-

1

(There should be a #include for the string library AND a using namespace std; in the header file)

Explanation:-

We can also include iostream library instead of string library but we must need to use using namespace std; because string is a part of std. If we dont want to use it - We can use an alternate by only including string library using #include and declaring string like below:

std::string

You can see below that program is only running when we include string library as well as a using namespace std; in header file!

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