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author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 08 Jan 2013 16:41:46 +0900
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def gcdLoop(x: Long, y: Long): Long = {
    var a = x
    var b = y
    while (a != 0) {
	val temp = a
	a = b % a
	b = temp
    }
    b
}