参照:
int a[N];
int *p;
为何 a-p 工作而 a+p 没有错误 : “ 无效的操作到二进制 + ” 。
两个指针之间的 < em> 差异 是有意义的, 即两个指针之间的元素数量( 前提是它们都位于同一个数组之内 ) 。
添加 两条指针没有道理( 您如何解释? ) 。
因为减法是有道理的,它就是两个指针之间的距离。加上指针是没有道理的。
在减法运算符中,您的数组衰变为 int/code >,并且考虑到两个指针是(1) 同一类型的,(2) 指向同一阵列中的元素,以及(b) 指针 T *b 大于指针 T *a ,然后标准保证 b - 是 T 和 b 之间的元素数。
然而,在您的情况中,指针没有指向同一阵列,因此,a - p 的结果没有定义(即使它汇编)。
(请注意,该标准更具体地说明了您何时和如何可以减去两个指针,但这主要是它。 )
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