View difference between Paste ID: HCG5ahL3 and M29RDr65

 /* Doubly linked list - Print (pop) as stack --- Adding tail */
 #include<iostream>
 #include<cstdio>
 #include<cstdlib>
 #include<cstring>
 using namespace std;
 
 void push(int x);
 void pop();
 void search(int y);
 
 int nodeCounter = 1;
 
 typedef struct alvi
 {
     int data;
     struct alvi *prev;
     struct alvi *next;
 }node;
 node *head = NULL;
 node *tail = NULL;
 
 int main(void)
 {
     int choice;
     while(1)
     {
         printf("Choose 1 for PUSH , 2 for pop , 3 for search , 4 for quit. \t Select : ");
         scanf("%d",&choice);
         switch(choice)
         {
             case 1:
                 int number;
                 printf("Enter number to push : ");
                 scanf("%d",&number);
                 push(number);
                 break;
             case 2:
                 pop();
                 break;
             case 3:
                 int find;
                 printf("Enter number to search : ");
                 scanf("%d",&find);
                 search(find);
                 break;
             case 4:
                 return 0;
                 break;
             default:
                 printf("Wrong Selection. Choose correct number \n");
                 break;
         }
     }
     return 0;
 }
 void push(int x)
 {
     node *newNode=new node();
     newNode->data=x;
     if(head==NULL&&tail==NULL)
     {
         newNode->prev=NULL;
         newNode->next=NULL;
 
         head=newNode;
         tail=newNode;
 
         printf("[INITIAL] Node : %d pushed \n",nodeCounter);
         nodeCounter++;
     }
     else
     {
         newNode->prev=tail;
         newNode->next=NULL;
 
         tail=newNode;
 
         printf("Node : %d pushed \n",nodeCounter);
         nodeCounter++;
     }
     printf("\n");
 }
 void pop()
 {
     node *cursor;
     cursor=tail;
     while(cursor!=NULL)
     {
         printf("%d ",cursor->data);
         cursor=cursor->prev;
     }
     printf("\n");
 }
 void search(int y)
 {
     int elementCounter=1;
     int flag=0;
     node *pointer;
     pointer=tail;
     while(pointer!=NULL)
     {
         if(pointer->data==y)
         {
             flag=1;
             printf("Found \n");
             printf("Element number : %d (Pop Serial) / %d (Push serial) \n",elementCounter,(nodeCounter-elementCounter));
             break;
         }
         pointer=pointer->prev;
         elementCounter++;
     }
     if(flag==0)
     {
         printf("Not Found \n");
     }
     printf("\n");
 }