hi guys the following function is correct. i need help understand the stack tracing. void RecursiveReverse(struct node** head) { struct node* first; struct node* rest; if (*head == NULL) return; // empty list base case first = *head; // suppose first = {1, 2, 3} rest = first->next; // rest = {2, 3} if (rest == NULL) return; // empty rest base case RecursiveReverse(&rest); // Recursively reverse the smaller {2, 3} case // after: rest = {3, 2}
first->next->next = first; // put the first elem on the end of the list first->next = NULL; // (tricky step -- make a drawing) *head = rest; // fix the head pointer } for example given list is : 3 -> 4 ->2 ->1 ->6 ->NULL after all recursive call finished i.e. after execution of this statement if (rest == NULL) return; // empty rest base case the stack will be like this 6 6 NULL 1 1 6 2 2 1 4 4 2 3 3 4 ----- ------- ------- head first rest 1 1 6 2 2 1 4 4 2 3 3 4 ----- ------- ------- head first rest 6 2 2 1 4 4 2 3 3 4 ----- ------- ------- head first rest 6 1 4 4 2 3 3 4 ----- ------- ------- head first rest . . . 6 1 2 4 ----- ------- ------- head first rest My question is "why stack "rest" is not changing?? thanks --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/algogeeks -~----------~----~----~----~------~----~------~--~---