singly linked list swap pairs... I've hit a brick wall

[Moooni]

Thanks.

[darwen]

The algorithm is :

If N is node to swap and N->Next is next in list then to swap N and N->Next

If N is end of list (i.e. N->Next == null) Then Error

If N is Head of list then
   Head of list = N->Next
   N->Next  = Head of list->Next
   Head of list->Next = N
Else
   Find Previous node to N.
   Previous node To N->Next = N->Next
   N->Next = Previous node to N->Next
   Previous Node to N->Next = N

Darwen.