null pointer in c

#include <stdio.h>

int main () {

   int  *ptr = NULL;
   printf("The value of ptr is : %x\n", ptr  );
   return 0;
}

output:::

little change in program:

#include <stdio.h>

int main () {

   int  *ptr = NULL;

   printf("The value of ptr is : %d\n", ptr  );

   return 0;

}

out put is same as above.