数据结构之静态队列（循环队列）

Posted 2020-09-18 药剂学徒

# include <stdio.h>
# include <malloc.h>

typedef struct Queue
{
    int * pBase;
    int front;
    int rear;
}QUEUE;  

void init(QUEUE *);
bool en_queue(QUEUE *, int val);  //入队
void traverse_queue(QUEUE *);
bool full_queue(QUEUE *);
bool out_queue(QUEUE *, int *);
bool emput_queue(QUEUE *);

int main(void)
{
    QUEUE Q;
    int val;

    init(&Q);
    en_queue(&Q, 1);
    en_queue(&Q, 2);
    en_queue(&Q, 3);
    en_queue(&Q, 4);
    en_queue(&Q, 5);
    en_queue(&Q, 6);
    en_queue(&Q, 7);
    en_queue(&Q, 8);

    traverse_queue(&Q);

    if ( out_queue(&Q, &val) )
    {
        printf("出队成功，队列出队的元素是: %d\n", val);
    }
    else
    {
        printf("出队失败!\n");
    }
    traverse_queue(&Q);

    return 0;
}

void init(QUEUE *pQ)
{
    pQ->pBase = (int *)malloc(sizeof(int) * 6);
    pQ->front = 0;
    pQ->rear = 0;
}

bool full_queue(QUEUE * pQ)
{
    if ( (pQ->rear + 1) % 6 == pQ->front  )
        return true;
    else
        return false;
}

bool en_queue(QUEUE * pQ, int val)
{
    if ( full_queue(pQ) )
    {
        return false;
    }
    else
    {
        pQ->pBase[pQ->rear] = val;
        pQ->rear = (pQ->rear+1) % 6;

        return true;
    }
}

void traverse_queue(QUEUE * pQ)
{
    int i = pQ->front;

    while (i != pQ->rear)
    {
        printf("%d  ", pQ->pBase[i]);
        i = (i+1) % 6;
    }
    printf("\n");

    return;
}

bool emput_queue(QUEUE * pQ)
{
    if ( pQ->front == pQ->rear )
        return true;
    else
        return false;
}

bool out_queue(QUEUE * pQ, int * pVal)
{
    if ( emput_queue(pQ) )
    {
        return false;
    }
    else
    {
        *pVal = pQ->pBase[pQ->front];
        pQ->front = (pQ->front+1) % 6;

        return true;
    }
}