Simple explanation of linked list

// linked list code

#include <stdio.h>
#include <stdlib.h>
#define max 10


typedef struct list
{
int dat;
   struct list *next;

}list;


int main()
{    
     list a,b,c,d,e;  // list variables
    list *ptr;   // pointer of type list whihc points to list variables
     a.dat =5;
     a.next= &b;
     b.dat=4;
     b.next =&c;
     c.dat=3;
     c.next =&d;
     d.dat=3;
     d.next=NULL;
     ptr=&a;
 while(ptr!=NULL)
 {
     printf("value at location %d \n", ptr->dat);
     ptr=ptr->next;
 }


return 0;

}