#include <stdio.h>

#includ

#include 
 #include 
 #define NULL 0
 int main(){
   struct node{
     int data;
     struct node *link;
   };
   struct node *p,*q;
   p=(struct node *) malloc(sizeof (struct node));
   q=(struct node *) malloc(sizeof (struct node));
   p->data=30;
   p->link=q;
   q->data=40;
   q->link=NULL;
   printf("%d ",p->data);
   p=p->link;
   printf("%d ",p->data);
   return 0;
 }

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