29 Input/output library [input.output]

29.5 Iostreams base classes [iostreams.base]

29.5.6 ios_­base manipulators [std.ios.manip] floatfield manipulators [floatfield.manip]

Each function specified in this subclause is a designated addressable function ([namespace.std]).
ios_base& fixed(ios_base& str);
Effects: Calls str.setf(ios_­base::fixed, ios_­base::floatfield).
Returns: str.
ios_base& scientific(ios_base& str);
Effects: Calls str.setf(ios_­base::scientific, ios_­base::floatfield).
Returns: str.
ios_base& hexfloat(ios_base& str);
Effects: Calls str.setf(ios_­base::fixed | ios_­base::scientific, ios_­base::floatfield).
Returns: str.
The more obvious use of ios_­base::hex to specify hexadecimal floating-point format would change the meaning of existing well-defined programs.
C++ 2003 gives no meaning to the combination of fixed and scientific.
end note
ios_base& defaultfloat(ios_base& str);
Effects: Calls str.unsetf(ios_­base::floatfield).
Returns: str.