[plt-scheme] Question about how to get the value of function

On May 31, 2010, at 9:19 AM, Hsiu-Hao Tsao wrote:

> define y '(1 2 3 4))
> >(define dt 1)
> >(define foo
>       (lambda (t) (do ((i 0 (+ i 1))) ((> i 3)) (if (and (>= t 0) (and (>= t (* i dt)) (< t (* (+ i 1) dt)))) (list-ref y i) #f))))

As the docs say: 

 "the value of the do form is #<void>"

(just F1 on do loop). Just like for loops in C and Java. 
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