/// <summary>
/// 減算
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static Fraction operator -(Fraction x, Fraction y)
{
//両分母の最小公倍数をとる
int lc = NumericOperation.LCM(x.denominator, y.denominator);
//分母が異なるなら最小公倍数/分母を分子にかける
if (x.denominator != y.denominator)
{
x.numerator *= (lc / x.denominator);
y.numerator *= (lc / y.denominator);
}
Fraction result = new Fraction(x.numerator - y.numerator, lc);
return(result);
}