Clojure function throws casting exception on println? How can one keep function & correct error?

Question

Outside of the function, the code works as expected, but in the following code it returns exception on a test site [Exception in thread "main" java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IFn]

How can I keep the function structure & get the results to print?

(defn sumTerm [hi lo] 
(if (< hi lo)
    (0)
    (let [
        terms (quot hi lo)
        tb (+ terms 1)
    ]
    (quot (* lo terms tb) 2)
    )             
))

let [
     ln 27
     a (sumTerm ln 4)
     b (sumTerm ln 7)
     abc (- (+ a b) (sumTerm ln 28))
 ]
 (println " abc= "(str abc))

What should this code do? Can you provide some test cases (input -> expected output)? And what is (now not defined) ln? — Martin Půda
– Martin Půda, Commented Nov 19, 2022 at 22:27

Eugene Pakhomov · Accepted Answer · 2022-11-19 21:04:40Z

2

It cannot work as expected unless you never hit the (< hi lo)'s "then" branch, because you're trying to call 0 as a function by wrapping it in parentheses.

Try replacing (0) with just 0.

answered Nov 19, 2022 at 21:04

Eugene Pakhomov

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1 Comment

MERLIN Over a year ago

That solved the issue. Thank you! My real function now resolves all Euler test cases. ;-)

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