关于const与指针混合使用的助记法

助记方法：把一个声明从右向左读

比如：

1. char * const cp; //cp is a const pointer to char

2. const char * cp; //cp is a pointer to const char;

规则：

¨ 声明从右到左读：

¨ * 读成 pointer to

¨ ** 读成 (a) pointer to (a) pointer to

¨ * const 读成 const pointer to

再比如：

1. char ** cpp; // cpp is a pointer toa pointer to char

2. const char ** cpp; // cpp is a pointer toa pointer to const char

3. char * const * cpp; // cpp is a pointer toconst pointer to char

4. const char * const * cpp; // cpp is pointer toconst pointer to const char

5. char ** const cpp; // cpp isconst pointer to
pointer to char

6. char * const * const cpp; // cpp is
const pointer to const pointer to char

7. const char * const * const cpp; // cpp is
const pointer to const pointer to const char