#include <stdio.h>
#include <malloc.h> 
typedef int element;
typedef struct ListNode{
    element data;
    struct ListNode *link;
}ListNode;
 
void display(ListNode *head){
    ListNode *p=head;
    while(p!=NULL){
        printf("%d\n", p->data);
        p=p->link;
    }
}
 
int main(){
 
    ListNode *p1,*p2;
    p1=(ListNode *)malloc(sizeof(ListNode));
    p2=(ListNode *)malloc(sizeof(ListNode));
 
    p1->data=10;
    p1->link=p2;
    p2->data=20;
    p2->link=NULL;
 
    display(p1);
 
    return 0;
}
 

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