Specifies that variables of type bool appear as 1 or 0 in the stream.
A reference to an object of type ios_base, or to a type that inherits from ios_base.
A reference to the object from which _Str is derived.
By default, noboolalpha is in effect.
noboolalpha effectively calls _Str.unsetf(ios_base::boolalpha), and then returns _Str.
boolalpha reverses the effect of noboolalpha.
See boolalpha for an example of using noboolalpha.