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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

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