咦,这不是越界了吗?移动五位都跑出a[]数组处于

那么,输出结果是多少呢?

  答:当然是5。

  为什么?

  答:上面不是说了嘛,&a就是一个行指针,那就是指向一行的指针咯。行指针+1,不就指向下一行了,这里一行为[5]个,那么int *p = (int *)(&a+1)就要在a的基础上偏离5个位置:(如下:上一行表示偏离位数,下一行表示a[]中对应的数据)

  0 1 2 3 4 5

  1 2 3 4 5 *

  咦,这不是越界了吗?移动五位都跑出a[]数组处于‘ * ‘号位置了。哦,我看到printf()输出了。你输出的是*(p-1),这里p是一个单指针-1就是往左位移一位就行了,那不就是又回到5的位置了吗?原来是这样,输出结果是5 。

  下面我们用一段代码来显示位移情况~~~

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