University
of Washington • CSE583 • D. Notkin © 2000
14
Two more special forms
lLocal variable bindings
–(define x
1) (define y 2) (define z 3)
(let ((x 5)
(y (+ 3 4))
(z (+ x y z)))
(+ x y z)
18
(let ((x 5)
(y (+ 3 4))
(z (+ x y z)))
(+ x y z)
18
lSequentially evaluated local variable bindings
–Replace
let by let*
–The
same expression evaluates to 27