Thread: Problem with user defined type value?

Say i have a structure like this:

Code:

typedef struct node {  int number;
                               struct node *next;
                             }NODE;

int main ()
{
  NODE *head=0;

return 0;
 
}

As you can see, its linear data structure, and this is the beginning of it. I don't understand what it means that head equals zero, does it means it points at nothing or it means value it has is zero (number) ?

Originally Posted by cdummie

does it means it points at nothing or it means value it has is zero (number) ?

It depends on your definition of "nothing". Assigning 0 to a pointer means that it 'points to address 0'.
In most systems dereferencing a null pointer will cause a segmentation fault, so in that sense, you could say it points to 'nothing'...

Originally Posted by phantomotap

O_o

Replace `NODE *' with `int *', could you answer the revised question?

Soma

I think i see it now, it means it points at nothing, the fact that the pointer is NODE only means it points to a variable whose type is NODE.