为什么会异常? - 编程论坛

代码如下:

程序代码：

p = (int *)calloc(1000000, sizeof(int));
printf("%p\t%p\t%p\t%p\t%p\n", p, p + 1, p + 2, p + 3, p + 1000);
//00000000009FD040        00000000009FD044        00000000009FD048        00000000009FD04C        00000000009FDFE0
scanf("%d\t%d\t%d\t%d\t%d", p, p + 1, p + 2, p + 3, p + 1000);
//1    2    3    4    5
printf("%d\t%d\t%d\t%d\t%d", *p, *(p + 1), *(p + 2), *(p + 3), *(p + 1000));
//1    2    4    4    5
p = (int *)realloc(p, 2 * sizeof(int));
printf("%p\t%p\t%p\t%p\t%p\n", p, p + 1, p + 2, p + 3, p + 1000);
//00000000009FD040        00000000009FD044        00000000009FD048        00000000009FD04C        00000000009FDFE0
printf("%d\t%d\t%d\t%d\t%d", *p, *(p + 1), *(p + 2), *(p + 3), *(p + 1000));
//1    2    3    4    5

当将p + 1000改为 p + 10000时

程序代码：

//0000000000C0E040        0000000000C0E044        0000000000C0E048        0000000000C0E04C        0000000000C17C80
//1       2       3       4       5
//1       2       3       4       5
//0000000000C0E040        0000000000C0E044        0000000000C0E048        0000000000C0E04C        0000000000C17C80
//这一行输出异常, 直接结束程序

请问为什么会发生上面的情况?