...
A function definition introduces a new local scope - the parameters are defined within the body.
(define (parameters...)
body)
A local definition introduces a new local scope - the names in the definitions are defined within both within the bodies of the definitions and within the local's body.
(local definitions...
body)
| Wiki Markup |
|---|
Note that the use of square brackets \[ \] here is equivalent to parentheses( ). The brackets help set off the definitions a little more clearly for readability. |
In order to use local and the other features about to be introduced in class, you need to set the DrScheme language level to "Intermediate".
Exercises
...
Finding #Finding the maximum element of a list.
...
Let's consider the problem of finding the maximum number in a list.
In general, there's an issue answering "What is the maximum number in
an empty list?"
To simplify the problem for today's goal, we'll only use non-negative
numbers, and define the maximum number of the empty list to be zero.
(Alternatively, we could write the function
only for non-empty lists.)
...
Develop the function without usinglocalusing local. For the
purposes of this exercise, do not use any helper functions, nor the
built-in Scheme functionmaxfunction max.
Stylisticallywhat don't (or shouldn't) you like about this
code?
...
Develop the function usinglocal. Again, don't use a
helper function, ormax.
| HTML |
|---|
...