For debuging I like
(define (show x)
(display x)
x)
(define (noshow x)
x)
For example in
(define (average x)
(/ (+ (car x) (show (cdr x))) 2))
noshow is useful to turn on/off them fast.
But this is different from the convension of << in the streams of C, that
return the stream instead of the value, something like
(<< (<< cout "Hello ") "Word!")
Gustavo
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