| const char* | char const* | char * const |

const char*和char const*以及char*const const char*, char const*, char*const的区别问题几乎是C++面试中每次都会有的题目。 事实上这个概念谁都有,只是三种声明方式非常相似很容易记混。

Bjarne在他的The C++ Programming Language里面给出过一个助记的方法： 把一个声明从右向左读。

char * const cp  ==> 读成 pointer to cp is a const pointer to char

const char * p ==>  p is a pointer to const char;

char const * p; 同上因为C++里面没有const*的运算符，所以const只能属于前面的类型。

        　　

C++标准规定，const关键字放在类型或变量名之前等价的。
const int n=5;                  ===> int const m=10;
const int *p;                   ===> const (int) * p
char ** p1;                     ===>pointer to pointer to char
const char **p2;                ===>pointer to pointer to const char
char * const * p3;              ===>pointer to const pointer to char
const char * const * p4;        ===>pointer to const pointer to const char
char ** const p5;               ===>const pointer to pointer to char
const char ** const p6;         ===>const pointer to pointer to const char
char * const * const p7;        ===>const pointer to const pointer to char
const char * const * const p8;  ===>const pointer to const pointer to const char