A union is a special class type that can hold only one of its non-static

Executes a statement repeatedly, until the value of condition becomes false. The test takes place after each iteration

Each name that appears in a C++ program

Elaborated type specifiers may be used to refer to a previously-declared class name (class, struct, or union) or to a previously-declared enum name even if the name was hidden

Constructor is a special non-static member