addNode

• void Linked::addNode(char ch)
• {
• Node * new_node = new Node;
• new_node->ch = ch;
• // special case, first node
• if(head == NULL)
• { head = new_node;
• last = new_node;
• return; }
• // o.w. add at end
• last->next = new_node;
• last = new_node;
• }