On 26/06/2013 23:47, Daniel Ajoy wrote:
"add" binds a to 1 at the moment of definition.
#;48> (define a 1)
#;49> (define (add x) (+ x a) )
#;50> (add 10)
11
#;51> (let ((a 100) ) (add 10) )
11
Is there a way to give a different value of "a" to add, so that,
something like this happens:
(let ((a 100) ) (add 10) )
110
(define a (make-parameter 1))
(define (add x) (+ x (a)))
(add 10)
(parameterize ((a 100))
(add 10))
(add 10)
yields
11
110
11
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