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Asked: 2026-06-13T01:16:18+00:00

I’m new to SCHEME, just starting. I have the following statement inside a (cond

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I’m new to SCHEME, just starting.

I have the following statement inside a (cond statement

((number? (list-ref inputList 0)) (display "First element is not a number"))

My problem is that I need it to return FALSE if the statement is true, how do I reverse the logic?

for example in Java it’d be (!(a==b)) or something similar.

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1 Answer

  1. Editorial Team

    Use the not function:

    ((not (number? (list-ref inputList 0))) (display "First element is not a number"))
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