string1.cpp (string constructors and operators)
string2.cpp (string comparisons)
string3.cpp (substr function)
string4.cpp (swap function)
string5.cpp (string size functions)
string6.cpp (string search functions)
string7.cpp (erase and replace functions)
string8.cpp (insert operations)
string9.cpp (C-style string conversion)

strdemo.cpp (The grand string demo)