public AngularUnit()
public AngularUnit(const AngularUnit &source)
The AngularUnit constructor produces a new instance of the AngularUnit class. There are two signatures for this constructor. The default constructor, which takes no arguments, creates an AngularUnit that is equivalent to degrees. The second constructor is a copy constructor, and it produces an AngularUnit whose value is the same as the AngularUnit passed as an argument.