Exercise 1.4
Specialization of persons with a union type

Introduce two variants of persons, as introduced in the C program on the accompanying slide.

• Persons who live at a specific location.
• Homeless persons, without location and without any id.

Introduce two different person types, and a union that allows us to represent either a 'person with a home address' or a 'homeless person'.

You can read about unions in The C++ Programming Language section C.8.2.