Project Euler

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# [[Problem 9]]

```scheme

#!r6rs

#!chezscheme

(import (chezscheme))

(define answer-9

  (let loop1 ([a 1])

    (if (< 333 a)

      (error "answer-9" "answer-9 was not found!")

      (let loop2 ([b a])

        (if (< 499 b)

          (loop1 (add1 a))

          (let ([c (- 1000 a b)])

            (if (= (+ (expt a 2)

                      (expt b 2))

                   (expt c 2))

              (* a b c)

              (loop2 (add1 b)))))))))

(printf "9: ~D~%" answer-9)

```