public static ListEntry Multiplication(ListEntry pol_1, ListEntry pol_2)
{
if (pol_1 != null && pol_2 != null)
{
// перемножение членов
ListEntry ans = new ListEntry();
ListEntry list = ans;
while (pol_1 != null)
{
ListEntry help_pol_2 = pol_2;
while (help_pol_2 != null)
{
list.Next = new ListEntry(pol_1.Degree + help_pol_2.Degree, pol_1.A * help_pol_2.A);
list = list.Next;
help_pol_2 = help_pol_2.Next;
}
pol_1 = pol_1.Next;
}
ans = ans.Next;
list = ans;
// приведение подобных
while (list != null)
{
ListEntry help_list = list.Next;
ListEntry help_list_last = list;
while (help_list != null)
{
if (help_list.Degree == list.Degree)
{
list.A += help_list.A;
help_list_last.Next = help_list.Next;
help_list = help_list.Next;
}
else
{
help_list_last = help_list_last.Next;
help_list = help_list.Next;
}
}
list = list.Next;
}
// удаление нулевых членов
while (ans.A == 0)
{
ans = ans.Next;
}
if (ans != null)
{
list = ans.Next;
ListEntry last_list = ans;
while (list != null)
{
if (list.A == 0)
{
last_list.Next = list.Next;
list = list.Next;
}
else
{
last_list = list;
list = list.Next;
}
}
}
return(ans);
}
else
{
return(null);
}
}