求助一个大家关于 C 语言 数组和指针 的问题

本题出自 C Primer Plus

#include<stdio.h>
#define SIZE 10
int sump(int *start,int *stop);
int main(void)
{
    int marbless[SIZE] = {20,10,5,39,4,16,19,26,31,20};
    long answer;
    answer = sump(marbless,marbless+SIZE);
    printf("%d",answer);
    return 0;
}
int sump(int *start,int *stop)
{
    printf("*start = %d\n",*start);
    printf("*stop = %d\n",*stop);
    int total = 0;
    while(start < stop)
    {
	    printf("start = %d\n",start);
	    printf("stop = %d\n",stop);
	    printf("*start = %d\n",*start);
	    printf("*stop = %d\n",*stop);
	    total += *start;
	    start++;
    }
    return total;
    }

添加 printf 后各输出如下：

*start = 20
*stop = 1
start = 6684192
stop = 6684232
*start = 20
*stop = 1
start = 6684196
stop = 6684232
*start = 10
*stop = 1
start = 6684200
stop = 6684232
....
190

不明白的就是为什么 *stop 的值会是 1 ？？ 不是 marbles + SIZE 吗？？ 求解！！