What is the use of writing "int *p = NULL;" as the output is same if it's replaced by "int *p;" ?

Question

int j = 63;
int *p = NULL;
p = &j;

printf("The address of j is %x\n", &j);
printf("p contains address %x\n", p);
printf("The value of j is %d\n", j);
printf("p is pointing to the value %d\n", *p);