CS212 Exams
Spring 1997 - Prelim 1

Evaluation of Scheme Expressions

For each of the following expressions determine what value would be returned by a Scheme interpreter, or describe what would happen if the expression is one that does not yield a value.

(let ((x 10)(f +))
  (let* ((x (f x x))(y (f x x)))
    (f y y)))

(let ((y 20))
  (let* ((x y)
         (f (lambda (x) (+ x y))))
    (f x)))

(head (tail (head (tail '(1 (2 (4)) 5)))))

```
((lambda (f) (f f)) (lambda (g) (g g)))
```
```
(+ ((lambda (x) x) 5) 4)
```

Solution

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