const char*, char const* and char *const 的区别

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;  
 //same as belowint const m=10;
 

const int *p;    //same as below 
const (int) * pint const *q;    // (int) const *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

 

转载于:https://www.cnblogs.com/papam/archive/2009/09/02/1559152.html