//从游标当前位置开始构造一个B类结点
private bool ConstructMultinomialB(out MultinomialB out1)
{
out1 = null;
try
{
out1 = new MultinomialB(1);
}
catch (Exception)
{
Error = "内存空间不足";
return false;
}
while (Seek < Fm.Length)
{
if (Fm[Seek] != '^' && IsOperator(Fm[Seek]) || Fm[Seek] == '(')
break;
else if (IsLetter(Fm[Seek]))
{
MultinomialA a;
try
{
a = new MultinomialA(Fm[Seek++]);
}
catch (Exception)
{
Error = "内存空间不足";
return false;
}
if (Seek < Fm.Length && Fm[Seek] == '^')
{
Double d;
if (!Degree(out d))
return false;
a.index = d;
}
out1.Insert(a);
}
else if (IsESC(Fm[Seek]))
Seek++;
else
{
if (IsNumber(Fm[Seek]))
Error = "字母后面不能直接跟数字";
else
Error = "存在非法字符：\"" + Fm[Seek] + "\"";
return false;
}
}
return true;
}
//B类结点的乘法运算
public static MultinomialB MUL(MultinomialB a, MultinomialB b)
{
try
{
if (a.coefficient == 0 || b.coefficient == 0)
return new MultinomialB(0);
}
catch (Exception)
{
throw;
}
MultinomialB c;
try
{
c = new MultinomialB(a);
}
catch (Exception)
{
throw;
}
c.coefficient *= b.coefficient;
for (int i = 0; i < b.count; i++)
c.Insert(b.Buf[i]);
return c;
}