public PolyList Multiply(PolyList right)
{
PolyList polyMuti = new PolyList();
PolyNode rightNode = (PolyNode)right.Header().Next;
PolyNode leftNode = (PolyNode)this.Header().Next;
while (leftNode != null)
{
//临时多项式
PolyList tempPoly = new PolyList();
PolyNode tempRightNode = rightNode;
while (tempRightNode != null)
{
//次数，相加
int value = leftNode.Value + tempRightNode.Value;
//系数，相乘
int coefficient = leftNode.Polynomial.Coefficient * tempRightNode.Polynomial.Coefficient;
//把单项式插入多项式中
PolyNode tempNode = (PolyNode)tempPoly.Append(value);
tempNode.Polynomial.Coefficient = coefficient;
tempRightNode = (PolyNode)tempRightNode.Next;
}
//循环结束代表一次乘法完成了，把临时多项式加到结果多项式中
polyMuti = polyMuti + tempPoly;
leftNode = (PolyNode)leftNode.Next;
}
return(polyMuti);
}
public PolyList Add(PolyList other)
{
PolyList polySum = new PolyList();
PolyNode rightNode = (PolyNode)other.Header().Next;
PolyNode leftNode = (PolyNode)this.Header().Next;
while (leftNode != null || rightNode != null)
{
//当右边为空时
if (rightNode == null)
{
PolyNode temp = leftNode;
leftNode = rightNode;
rightNode = temp;
}
//当左边为空的时候
if (leftNode == null)
{
while (rightNode != null)
{
PolyNode temp = (PolyNode)polySum.Append(rightNode.Value);
temp.Polynomial.Coefficient = rightNode.Polynomial.Coefficient;
rightNode = (PolyNode)rightNode.Next;
}
}
//当大于
else if (leftNode.Value > rightNode.Value)
{
PolyNode temp = (PolyNode)polySum.Append(leftNode.Value);
temp.Polynomial.Coefficient = leftNode.Polynomial.Coefficient;
leftNode = (PolyNode)leftNode.Next;
}
//等于 等于是记得考虑系数为空后去掉
else if (leftNode.Value == rightNode.Value)
{
int coefficient = leftNode.Polynomial.Coefficient + rightNode.Polynomial.Coefficient;
//为0就不需要插入元素了
if (coefficient != 0)
{
PolyNode temp = (PolyNode)polySum.Append(leftNode.Value);
temp.Polynomial.Coefficient = coefficient;
}
leftNode = (PolyNode)leftNode.Next;
rightNode = (PolyNode)rightNode.Next;
}
//小于
else if (leftNode.Value < rightNode.Value)
{
PolyNode temp = leftNode;
leftNode = rightNode;
rightNode = temp;
PolyNode tempNode = (PolyNode)polySum.Append(leftNode.Value);
tempNode.Polynomial.Coefficient = leftNode.Polynomial.Coefficient;
leftNode = (PolyNode)leftNode.Next;
}
}
return(polySum);
}