C++ Primer Plus, Fourth Edition

Use the New Header Organization

The Standard specifies new names for the header files, as described in Chapter 2, “Setting Out to C++.” If you've been using the old-style header files, you should change over to using the new-style names. This is not just a cosmetic change because the new versions might add new features. For example, the ostream header file provides support for wide-character input and output. It also provides new manipulators such as boolalpha and fixed (as described in Chapter 17, “Input, Output, and Files”). These offer a simpler interface than using setf() or the iomanip functions for setting many formatting options. If you do use setf(), use ios_base instead of ios when specifying constants; that is, use ios_base::fixed