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(define (gcd a b)
(if (= b 0)
a
(gcd b (remainder a b))))
;(define (make-rat n d) (cons n d))
(define (make-rat n d)
(let ((g (gcd n d)))
(cons (/ n g)
(/ d g))))
(define (numer x) (car x))
(define (denom x) (cdr x))
(define (add-rat x y)
(
make-rat (+ (* (numer x) (denom y))
(* (numer y) (denom x)))
(* (denom x) (denom y))))
(define (sub-rat x y)
(make-rat (- (* (numer x) (denom y))
(* (numer y) (denom x)))
(* (denom x) (denom y))))
(define (mul-rat x y)
(make-rat (* (numer x) (numer y))
(* (denom x) (denom y))))
(define (div-rat x y)
(make-rat (* (numer x) (denom y))
(* (denom x) (numer y))))
(define (equal-rat? x y)
(= (* (numer x) (denom y))
(* (numer y) (denom x))))
(define (print-rat x)
(newline)
(display (numer x))
(display "/")
(display (denom x)))
(define one-half (make-rat 1 2))
(print-rat one-half)
(define one-third (make-rat 1 3))
(print-rat one-third)
(print-rat
(mul-rat one-half one-third))
(print-rat
(add-rat one-third one-third))
(print-rat
(make-rat -1 1))
(define (print-point p)
(newline)
(display "(")
(display (x-point p))
(display ",")
(display (y-point p))
(display ")"))
(define ())
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