Specifies that integer variables appear in base 8 notation.
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, integer variables are displayed in base 10 notation. dec and hex also change the way integer variables appear.
The manipulator effectively calls _Str.setf(ios_base::oct, ios_base::basefield), and then returns _Str.
See dec for an example of how to use oct.
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