数据结构--循环队列

循环队列的基本功能：

#include 
#include 
#include 
#define MAX_SIZE 1000
#define OVERFLOW 1
typedef struct CircleIntQueue{
	int data[MAX_SIZE];
	int head;
	int tail;
}CircleIntQueuer,*circleintqueue;
circleintqueue initQueue() {
	circleintqueue resultPtr = (circleintqueue)malloc(sizeof(CircleIntQueue));
	resultPtr->head = 0;
	resultPtr->tail = 0;
	return resultPtr;
}
void enqueue(circleintqueue paraPtr, int Value) {
	if ((paraPtr->tail + 1) % MAX_SIZE == paraPtr->head) {
		printf("队列已满！！rn");
		exit(OVERFLOW);
	} 
	paraPtr->data[paraPtr->tail % MAX_SIZE] = Value;
	paraPtr->tail++;
}
int dequeue(circleintqueue paraPtr) {
	int resultValue;
	if (paraPtr->head == paraPtr->tail) {
		printf("队列为空.rn");
		return -1;
	} // Of if

	resultValue = paraPtr->data[paraPtr->head % MAX_SIZE];
	paraPtr->head++;

	return resultValue;
}
void outputLinkQueue(circleintqueue paraPtr){
	int i;
	if (paraPtr->head == paraPtr->tail) {
		printf("队列为空.");
		return;
	}
	printf("队列的元素：");
	for (i = paraPtr->head; i < paraPtr->tail; i++) {
		printf("%d ", paraPtr->data[i % MAX_SIZE]);
	} 
	printf("rn");
}
void testLinkQueue(){
	int i = 10;
	circleintqueue tempPtr = initQueue();
	for (; i < 16; i ++) {
		enqueue(tempPtr, i);
	}
	outputLinkQueue(tempPtr);

	for (i = 0; i < 6; i ++) {
		printf(" 依次出队：%drn", dequeue(tempPtr));
	}
	enqueue(tempPtr, 8);
	printf("入队8后：") ;
	outputLinkQueue(tempPtr);
}
int main(){
    testLinkQueue();
    return 1;
}

运行结果：

总结：

队列为空和队列已满，前后指针都指向同一位置。这时要注意分辨情况