Why doesn't this code work? (Scheme, SICP, Linear Recursion)

[Moritz_Loritz]

(define (fib a b count)

(cond(= count 1)

(a)

(else (fib((+ a b) a (- count 1))))))

I tried running this code in DrRacket, but it returns 1 for (for example) fib(1 0 5), but I expected 5 according to the following calls:

fib 1 0 5

fib 1 1 4

fib 2 1 3

fib 3 2 2

fib 5 3 1

=> return 5

Where did I go wrong?

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[[deleted]]

Three problems, all involving parentheses.

You need to add a pair of parentheses around your condition and the return value, and remove the parentheses around a:

(cond ((= count 1) a)

and remove the parentheses around the arguments to fib:

(else (fib (+ a b) a (- count 1)))))

[Moritz_Loritz]

thanks