The header file that you must #include to have access to the Standard Library string class is

Question

a. C-string
b. string.h
c. string
d. String.h
e. None of the above

Answer 1

c)
Explanation: There is no .h extension on C++ header files, nor the ones that C++ has inherited from C and then converted. C++ uses the header. The string.h include file is header file used by C++ prior to the C++ Standard. It is still provided by some C++ compilers for backward compatibility but its use is discouraged. String.h is an outdated header for a proprietary string library.