public static Fraction operator -(Fraction x, Fraction y)
{
var gcd = MathLibEx.Gcd(x.Denominator, y.Denominator);
var lcm = x.Denominator / gcd * y.Denominator;
return(new Fraction((x.Numerator * y.Denominator - y.Numerator * x.Denominator) / gcd, lcm));
}
public Fraction(long 分子, long 分母)
{
if (分母 == 0)
{
_numerator = Math.Sign(分子) switch
{
0 => 0,
1 => int.MaxValue,
_ => int.MinValue,
};
_denominator = -1;
return;
}
var negative = (分子 ^ 分母) < 0;
分子 = Math.Abs(分子);
分母 = Math.Abs(分母);
if (分子 == 0)
{
_numerator = 0;
_denominator = 0;
}
else
{
var gcd = MathLibEx.Gcd(分母, 分子);
_numerator = 分子 / gcd;
if (negative)
{
_numerator = -_numerator;
}
_denominator = 分母 / gcd - 1;
}
}
