“application: not a procedure” while computing binomial

Question

I am defining a function binomial(n k) (aka Pascal\'s triangle) but am getting an error:

    application: not a procedure;
    expected a procedure          


        

Answer 1

Your error is here:

binomial(n)

n is an integer, not a function. If you put parentheses around it like that, scheme tries to invoke an integer as a function, which naturally produces an error.