代码实现：

typedef struct {int front;int back;int k;int* a;} MyCircularQueue;bool myCircularQueueIsEmpty(MyCircularQueue* obj) {return obj->front==obj->back;
}bool myCircularQueueIsFull(MyCircularQueue* obj) {return (obj->back+1)%(obj->k+1)==obj->front;
}MyCircularQueue* myCircularQueueCreate(int k) {MyCircularQueue* obj=(MyCircularQueue*)malloc(sizeof(MyCircularQueue));obj->a=(int*)malloc(sizeof(int)*(k+1));obj->front=0;obj->back=0;obj->k=k;return obj;
}bool myCircularQueueEnQueue(MyCircularQueue* obj, int value) {if(!myCircularQueueIsFull(obj)){obj->a[obj->back]=value;obj->back++;(obj->back)%=(obj->k+1);return true;}return false;
}bool myCircularQueueDeQueue(MyCircularQueue* obj) {if(myCircularQueueIsEmpty(obj)){return false;}else ++obj->front;(obj->front)%=(obj->k+1);return true;
}int myCircularQueueFront(MyCircularQueue* obj) {if(myCircularQueueIsEmpty(obj)){return -1;}elsereturn obj->a[obj->front];
}int myCircularQueueRear(MyCircularQueue* obj) {if(myCircularQueueIsEmpty(obj))return -1;elsereturn obj->a[(obj->back-1+obj->k+1)%(obj->k+1)];
}void myCircularQueueFree(MyCircularQueue* obj) {free(obj->a);obj->a=NULL;free(obj);obj=NULL;
}