高手们进来看看啊

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

#define null 0

typedef struct node //定义链队列
{
    int data;
    struct node *next;
}link;

typedef struct
{
    link *front;
    link *rear;
}linknode;

linknode *cas() //链队列入队
{
    linknode *s = (linknode*)malloc(sizeof(linknode));
    s->front = s->rear = null;
    link *p;
    int x,tag;
    int flag = 0;

    printf("请输入结束符");
    scanf("%d",&tag);
    printf("请输入数据：");
    scanf("%d",&x);
    while(x != tag)
    {
        p=(link*)malloc(sizeof(link));
        p->data = x;
        p->next = null;
        if(flag == 0)
        {
            s->rear = s->front = p;
            flag = 1;
        }
        else
        {
            s->rear = s->rear->next = p;

        }
        printf("请输入数据：");
        scanf("%d",&x);
    }
    return s;
}

void de(linknode *s,int *c)  //链队列出队
{
    link *p;
    c = (int *)malloc(sizeof(int));
    *c = 0;
    int i=1;

    while(s->front!=0)
    {
        p=s->front;
        s->front=p->next;
        c = (int *)realloc(c, (i+1)*sizeof(int));
        *(c+i-1) = p->data;
        *(c+i) = 0;
        ++i;
        free(p);
    }
    for(i=0; *(c+i) != 0; ++i)
        printf("%d ",*(c+i));
    printf("\n");   
}

void main()        
{
    int *c;
    linknode *s;
    s=cas();
    de(s,c);
}