C: transitive (double) assignments

Question

I have used such construct in C:

list->head = list->tail = NULL;

and now I consider whether this really mean what I suppose.

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Answer 1

it's multiple assignment as your first option is the right one

list->head = list->tail = NULL;

it's a magic of flow.

initially ,tail is set to NULL ,starting from right to left

list->tail = NULL;

then list->head = list->tail ;

now tail is NULL so the head will also assigned a NULL value