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#include <stdio.h>

int main(void)
{
int a[5] = {1, 2, 3, 4, 5};
int (*p)[5];
int *ptr;

p = &a;
//printf("*p : %d\n", **p);

ptr = (int *)(p+1);
//printf("*ptr : %d\n", *ptr);

printf("the result id : %d\n", *(ptr-1));

return 0;
}

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int (*p)[5];
pÊÇÊý×éÖ¸Õë,Ö¸ÏòÒ»¸ö°üº¬5¸öintÐÍÔªËØµÄÊý×é!


p = &a;
pÖ¸ÏòÁËÊý×éa.

p+1 ÊÇÔ½¹ý5¸öintÐÍÔªËØµÄÊý×éµÄ·¶Î§,Ö¸ÏòÏÂÒ»¸ö°üº¬5¸öintÐÍÔªËØµÄÊý×é!ÕâÀïÓ¦¸ÃÊDz»È·¶¨µÄ!

ptr = (int *)(p+1);
ptr Ö¸ÏòµÚ¶þ¸öÊý×éµÄÊ×ÔªËØµØÖ·.
ptr-1 µ±È»¾ÍÖ¸ÏòÁËǰһ¸öÊý×éµÄ×îºóÒ»¸öÔªËØ.ÕâÀï¾ÍÊÇaµÄ×îºóÒ»¸öÔªËØ.

*(ptr - 1)¾ÍÓ¦¸ÃÊÇaµÄ×îºóÒ»¸öÔªËØÖµ!

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p=&a;ÕâÀïºÃÏñÓÐÎÊÌâ


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int (*p)[5];
pÊÇÊý×éÖ¸Õë,Ö¸ÏòÒ»¸ö°üº¬5¸öintÐÍÔªËØµÄÊý×é!


p = &a;
pÖ¸ÏòÁËÊý×éa.

p+1 ÊÇÔ½¹ý5¸öintÐÍÔªËØµÄÊý×éµÄ·¶Î§,Ö¸ÏòÏÂÒ»¸ö°üº¬5¸öintÐÍÔªËØµÄÊý×é!ÕâÀïÓ¦¸ÃÊDz»È·¶¨µÄ!

ptr = (int *)(p+1);
ptr Ö¸ÏòµÚ¶þ¸öÊý×éµÄÊ×ÔªËØµØÖ·.
ptr-1 µ±È»¾ÍÖ¸ÏòÁËǰһ¸öÊý×éµÄ×îºóÒ»¸öÔªËØ.ÕâÀï¾


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