void Gcd()
{
Assert.Equal(42, MathX.Gcd(42, 42));
Assert.Equal(1, MathX.Gcd(42, 23));
Assert.Equal(6, MathX.Gcd(42, 30));
Assert.Equal(6, MathX.Gcd(30, 42));
//0以下は未定義
Assert.Equal(114, MathX.Gcd(0, 114));
Assert.Equal(514, MathX.Gcd(514, 0));
Assert.Equal(0, MathX.Gcd(0, 0));
}
