int (*p)[4] =a;
int (*p)[4] =*a;
int (*p)[4] =a[0];
int (*p)[4] =&a[0];
int (*p)[4] =&a[0][0]; 地址值相同

int (*p)[4] =a;
int (*p)[4] =*a;
int (*p)[4] =a[0];
int (*p)[4] =&a[0];
int (*p)[4] =&a[0][0]; 地址值相同