//Denomiator是分母
public Fraction(long molecular, long denomiator)
{
//Note:Molecular 是分子，Denomiator是分母，这里可以是一个假分数传入
//计算时都使用假分数计算，但是在显示时使用真分数
this.Molecular = molecular;
if (denomiator == 0)
{
throw new MyException.OwnException("有表达式中出现了分母为0！");
}
this.Denomiator = denomiator;
Fraction.Reduce(ref this.Molecular, ref this.Denomiator);
}
public static Fraction operator *(Fraction lhs, Fraction rhs)
{
long Mo1, Mo2;
long De1, De2;
long MoMult, DeMult;
Mo1 = lhs.GetMo();
Mo2 = rhs.GetMo();
De1 = lhs.GetDe();
De2 = rhs.GetDe();
checked
{
MoMult = Mo1 * Mo2;
DeMult = De1 * De2;
}
Fraction.Reduce(ref MoMult, ref DeMult);
return(new Fraction(MoMult, DeMult));
}
public static Fraction operator -(Fraction lhs, Fraction rhs)
{
long Mo1, Mo2;
long De1, De2;
long MoSub, DeSub;
Mo1 = lhs.GetMo();
Mo2 = rhs.GetMo();
De1 = lhs.GetDe();
De2 = rhs.GetDe();
//lhs = Mo1/De1 , rhs = Mo2/De2
checked
{
MoSub = Mo1 * De2 - Mo2 * De1;
DeSub = De1 * De2;
}
Fraction.Reduce(ref MoSub, ref DeSub);
return(new Fraction(MoSub, DeSub));
}
public static Fraction operator +(Fraction lhs, Fraction rhs)
{
long Mo1, Mo2;
long De1, De2;
long MoSum, DeSum;
Mo1 = lhs.GetMo();
Mo2 = rhs.GetMo();
De1 = lhs.GetDe();
De2 = rhs.GetDe();
//rhs = Mo1/De1 lhs = Mo2/De2
checked
{
MoSum = Mo1 * De2 + Mo2 * De1;
DeSum = De1 * De2;
}
Fraction.Reduce(ref MoSum, ref DeSum);
return(new Fraction(MoSum, DeSum));
}
public static Fraction operator /(Fraction lhs, Fraction rhs)
{
long Mo1, Mo2;
long De1, De2;
long MoDiv, DeDiv;
Mo1 = lhs.GetMo();
Mo2 = rhs.GetMo();
De1 = lhs.GetDe();
De2 = rhs.GetDe();
checked
{
MoDiv = Mo1 * De2;
DeDiv = Mo2 * De1;
}
if (DeDiv == 0)
{
throw new MyException.OwnException("除数不能为0！");
}
Fraction.Reduce(ref MoDiv, ref DeDiv);
return(new Fraction(MoDiv, DeDiv));
//lhs = Mo1/De1 rhs = Mo2/De2 , lhs / rhs = (Mo1 *De2)/(Mo2 *De1)
}
