Suppose you have the following struct definition and typedef statements in your program:

What will be an ideal response?
```
struct N
{
double d;
N *next;
};
typedef N* node_ptr;
node_ptr p1;
Now suppose further that p1 points to a node of type N in a linked list. Write code
that makes p1 point to the next node on the linked list.
```

```
p1 = p1->next;
```