#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int find_zero(int a[],int n)
{
    int * p = NULL;
    int * q = NULL;
    p = a;
    q = a + n -1;
    while(p <= q)
    {
        if(*p == 0)
        {
            return p-a;
        }
        if(*q == 0)
        {
            return q-a;
        }
        p++;
        q--;
    }
   
    printf("NO zero!\n");
    return -1;
}
int main(void)
{
    int a[20] = {0};
    int * p = a;
    srand(time(NULL));
    do{
        *p = rand()%20;
        printf("%3d",*p);
        p++;
    }while(p < a+19 );
printf("\n");
    printf("%d\n",find_zero(a,20));
    return 0;
   
}








求大神指点啊，怎么错了，感觉没有运行，返回值是错的

    do{
        *p = rand()%20;
        printf("%3d",*p);
        p++;
    }while(p < a+19 ); // + 19要改成+20 否则只能初始化 19个数字