Beginner C: Learn about 'NULL' Keyword

Tuesday, 24 July 2012 | Unknown at 12:15 |

#include <stdio.h>

void main()
 {
 printf("%d", NULL);

 }

output :
 0
because keyword NULL is defined in a macro with a value defined 0.
that's y in case of linked list we write the following condition :-

while(start)
 {
 start=start->next // to traverse the linked list

}