Question

Here is my code:

struct queue {
        int queue_arr[5];
        int rear;
        int front;
};

int main()
{
        struct queue q;
        int choice;

        queue_init(q);
}

queue_init(struct queue *q)
{
        int i = 0;
        q->rear = -1;
        q->front = -1;
        for (; i < MAX; i++) {
                q->queue_arr[i] = 0;
        }
}

It causes segmentation error on execution:

[root@workmachine test_cpp]# ./queue  Segmentation fault (core dumped)

If I remove struct I’ll use int queue_arr[5]; int rear; int front; as global segmentation error disappears. Why? and how to to avoid it whit using of structs?

Answer 1

You should pass the address:

queue_init(&q);
           ^

I’m surprised it compiles as it stands.