#include #include typedef int element; typedef struct QueueNode{ element item; struct QueueNode *link; }QueueNode; typedef struct { QueueNode *front,*rear; }QueueType; void error(char *message); void init(QueueType *q); int is_empty(QueueType *q); void enqueue(QueueType *q,element item); element dequeue(QueueType *q); //void display_linked_queue(QueueType *q); int main(void){ QueueType q; init(&..