Question

I have the following struct:

struct cell {
    int nmbr;
    struct cell *p;
};

I have created a chain of linked structs from this type. Every struct is connected to its predecessor through *p. If I decide to print all nmbrs with a recursive algorithm as shown below, how do I define the stop condition?

void write(struct cell* l) {
    /* The following if statement doesn't solve my problem,
       but hopefully you see what I'm trying to do */
    if (&l != 0x000000) {
        printf("%d \t", l->nmbr);
        write(l->p);
    }
}

Answer 1

You want

if (l != 0)

or

if (l != NULL)

Of course, you also need to make sure that the tail of your linked list has p assigned NULL as well; otherwise it will be uninitialized and probably something not NULL but invalid anyway.