用c语言写循环队列函数

以下是用c语言写循环队列函数的示例代码：

#include <stdio.h>
#include <stdlib.h>

#define MAX_QUEUE_SIZE 100

typedef struct {
int front, rear;
int data[MAX_QUEUE_SIZE];
} Queue;

void initQueue(Queue *q) {
q->front = q->rear = 0;
}

int isQueueEmpty(Queue *q) {
return q->front == q->rear;
}

int isQueueFull(Queue *q) {
return (q->rear + 1) % MAX_QUEUE_SIZE == q->front;
}

int enqueue(Queue *q, int value) {
if (isQueueFull(q)) {
printf("Error: queue is full\n");
return -1;
}

q->data[q->rear] = value;
q->rear = (q->rear + 1) % MAX_QUEUE_SIZE;

return 0;
}

int dequeue(Queue *q, int *value) {
if (isQueueEmpty(q)) {
printf("Error: queue is empty\n");
return -1;
}

*value = q->data[q->front];
q->front = (q->front + 1) % MAX_QUEUE_SIZE;

return 0;
}

int main() {
Queue q;
int value;

initQueue(&q);

enqueue(&q, 10);
enqueue(&q, 20);
enqueue(&q, 30);

dequeue(&q, &value);
printf("%d\n", value);

dequeue(&q, &value);
printf("%d\n", value);

enqueue(&q, 40);
enqueue(&q, 50);

dequeue(&q, &value);
printf("%d\n", value);

dequeue(&q, &value);
printf("%d\n", value);

dequeue(&q, &value);
printf("%d\n", value);

return 0;
}