doubly, C++ (gcc) - rextester

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# include <iostream>
using namespace std;

class Node {
    
    public:
    int data;
    Node* next;
    Node* prev;
};

void add_first(Node* &head,int new_data){

Node*new_node = new Node();

new_node->data=new_data;
    new_node->next=head;
    new_node->prev=NULL;
    head = new_node;
}

void add_end(Node* &head,int new_data){
     
     Node* new_node =new Node();
     new_node->data=new_data;
     Node*temp=head;

while(temp->next!=NULL){
         temp=temp->next;
     }
     temp->next=new_node;
     new_node->prev=temp;
}

void add_pos(Node* &head, int pos ,int new_data){
   
    if(pos==1){
        cout<<"call another function"<<endl;
        return;
    }

int i=1;
    Node* new_node =new Node();
    new_node->data=new_data;
    Node* temp=head;

while (i<pos-1)
    {   
        temp=temp->next;
        i++;
    }

new_node->next=temp->next;
    new_node->prev=temp;
    temp->next=new_node;
    temp=temp->next;
    
    temp->prev=new_node;

}

void del_key(Node* &head,int key){
   
    if(head->data==key){
        head=head->next;
        return;
    }

Node*temp1=head;
   Node*temp2=head;
  
   while(temp1->data!=key){
       temp2=temp1;
       temp1=temp1->next;
       
   }
   temp2->next=temp1->next;
   temp1=temp1->next;
   temp1->prev=temp2;

}

void disp(Node* head){

int cnt=0;
    while(head!=NULL){
        cout<<" "<<head->data;
       
        head=head->next;
        cnt++;
    }
    cout<<endl<<"the length of linked list is "<<cnt;
}

void reverse_list(Node* &head){

Node*curr;
    Node*nxt;
    Node*prev;
    
   
    curr=head;

while(curr!=NULL){
         
     nxt=curr->next;
     curr->next=curr->prev;
     curr->prev=nxt;
     prev=curr;
     curr=nxt;
     
         
    }
     head=prev;
    
}

int main(){
    
    Node*head=NULL;
    
    add_first(head,7);
    add_first(head,8);
    add_first(head,9);
    add_first(head,0);
    add_end(head,1);
    add_end(head,2);
    add_pos(head,2,4);
    del_key(head,0);
    reverse_list(head);
    
    cout<<"the linked list is ";

disp(head);

return 0;
}

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Compilation time: 0.53 sec, absolute running time: 0.16 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,78 sec