Back to notes -- Keyboard shortcut: 'u'  previous -- Keyboard shortcut: 'p'  next -- Keyboard shortcut: 'n'  Slide program -- Keyboard shortcut: 't'    A dialogue using class x and class y.Lecture 8 - slide 11 : 11
Program 3
1> (define a (new-instance x))

2> (define b (new-instance y))

3> (send 'res a)
1

4> (send 'res b)
2