Thread: Double Link List Swap function

K here is my swap function. The only problem i have is what if you want to swap the last node it crashes. Plz someone help i have been tryong to figure out a way to get that in like a week now. And we are not spostu swap the data of the node but the full node thanks. here is waht i got any tips be great.
oops forgot the first and last node cause of the NULL and it is different senario and beside that forgot to say taht the last pointer is last first pointer is first.

Code:

void swap(int nodea,int nodeb)
             {
                  if (nodea>nodeb)
                  {
                      int Temp;
                      Temp=nodeb;
                      nodeb=nodea;
                      nodea=Temp;
                  }
                  
                  Node* NodeA=first;
                  Node* NodeB=first;
                  Node* temp1;
                  Node* temp2; 
                 
                  for (int x=0;x<nodea;x++)
                      NodeA=NodeA->next;
                  for (int x=0;x<nodeb;x++)
                      NodeB=NodeB->next;
                      
                  if ((nodea+1)==nodeb||(nodea-1)==nodeb)
                  {
                      NodeB->next->prev=NodeA;
                      NodeA->prev->next=NodeB;
                      NodeB->prev=NodeA->prev;
                      NodeA->next=NodeB->next;
                      NodeA->prev=NodeB;
                      NodeB->next=NodeA;
                  }
                  else
                  {
            
                      temp1=NodeA->next;
                      temp2=NodeB->prev;
                      
                      NodeA->next=NodeB->next;
                      NodeB->prev=NodeA->prev;
                      
                      NodeB->next=temp1;
                      NodeA->prev=temp2;
                      
                      NodeA->next->prev=NodeA;
                      NodeA->prev->next=NodeA;
                      
                      NodeB->next->prev=NodeB;
                      NodeB->prev->next=NodeB;
                   }
                      
             }