b是一个常量
const int b; /* b is a int const /
int const b; / b is a const int */
p是一个普通指针,指向一个常量
const int p; / p is a pointer to int const */
int const p; / p is a pointer to const int */
p是一个常量指针,指向一个普通变量
int const p; / p is a const pointer to int */
p是一个常量指针,指向一个常量
const int const p; / p is a const pointer to int const */
int const const p; / p is a const pointer to const int */