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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. class node{
  5. public:
  6.     int data;
  7.     node *next;
  8.     //constructor
  9.     node(int d){
  10.         data=d;
  11.         next=NULL;
  12.     }
  13.  
  14. };
  15. void insertAtTail(node *&head, int data){
  16.     if(head==NULL){
  17.         head=new node(data);
  18.         return;
  19.     }
  20.     node *tail=head;
  21.     while(tail->next!=NULL){
  22.         tail=tail->next;
  23.     }
  24.     tail->next=new node(data);
  25.     return;
  26. }
  27. void buildInput(node *&head){
  28.     int data;
  29.     cin>>data;
  30.     while(data!=-1){
  31.         insertAtTail(head,data);
  32.         cin>>data;
  33.     }
  34. }
  35. void reverseIterative(node *&head){
  36.     node * curr=head;
  37.     node * n;
  38.     node * prev =NULL;
  39.     while(curr!=NULL){
  40.         //store the next list
  41.         n=curr->next;
  42.         //make current node point to previous
  43.         curr->next=prev;
  44.         //update
  45.         prev=curr;
  46.         curr=n;
  47.     }
  48.     head = prev;
  49. }
  50.  
  51. node* reverseRecursive(node *head{
  52.     if(head->next==NULL||head==NULL){
  53.         return head;
  54.     }
  55.     node *smallHead= reverseRecursive(head->next);
  56.     node * curr=head;
  57.     curr->next->next=curr;
  58.     curr->next=NULL;
  59.     return smallHead;
  60. }
  61.  
  62. void print(node *head){
  63.     //node *temp=head;
  64.     while(head!=NULL){
  65.         cout<<head->data;
  66.         head=head->next;
  67.     }
  68. }
  69. int main(){
  70.     node *head=NULL;
  71.     buildInput(head);
  72.     reverseIterative(head);
  73.     head = reverseRecursive(head);
  74.     print(head);
  75. return 0;}
  76.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:51:34: error: expected ‘)’ before ‘{’ token
 node* reverseRecursive(node *head{
                       ~          ^
                                  )
stdout 
Standard output is empty
https://ideone.com/Mi3bjp
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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