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Dec 5th, 2019
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  1. (let ((x (read)))
  2.     (try (try (throw "cannot divide by zero")
  3.      catch
  4.      (lambda (exn)
  5.        (cond ((= 0 (caddr x))
  6.               (display exn)
  7.               (newline)))
  8.        (throw "No fractions allowed")))
  9.          catch
  10.          (lambda (exn)
  11.            (cond ((not (integer? (/ (cadr x) (caddr x)))) (display exn)
  12.                   (newline))
  13.                  (else (display (/ (cadr x) (caddr x))))))))
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